Ophthalmology – Thyroid Optic Neuropathy

What the Disorder Represents

Thyroid optic neuropathy, more commonly termed dysthyroid optic neuropathy (DON), is the most important sight-threatening neurologic complication of thyroid eye disease (TED).

It usually results from:

Compression of the optic nerve at the orbital apex by enlarged extraocular muscles

and can cause:

• Reduced visual acuity
• Color desaturation
• Relative afferent pupillary defect
• Visual-field loss
• Permanent optic atrophy if treatment is delayed

DON is an:

Ophthalmic emergency.

Relationship to Thyroid Eye Disease

TED is an autoimmune orbital disorder most commonly associated with:

Graves disease

but may also occur in patients who are:

• Euthyroid
• Hypothyroid
• Occasionally associated with Hashimoto thyroiditis

Therefore:

Normal thyroid hormone levels do not exclude TED or DON.

Why the Optic Nerve Becomes Compromised

TED causes inflammatory enlargement of:

• Extraocular muscles
• Orbital fat
• Connective tissue

Within the fixed bony orbit, enlarged extraocular muscles can crowd the:

Orbital apex

and compress the optic nerve and its vascular supply.

This is the principal mechanism of DON.

Less Common Mechanisms of Optic Neuropathy

Optic nerve dysfunction may also occasionally result from:

• Severe proptosis with optic nerve stretch
• Orbital vascular congestion
• Increased orbital pressure
• Ischemic compromise

However, the classic mechanism is:

Apical muscle crowding.

Modern Understanding of TED Autoimmunity

Orbital fibroblasts express:

• TSH receptor
• IGF-1 receptor

Autoimmune stimulation leads to:

• Cytokine release
• Glycosaminoglycan accumulation
• Tissue edema
• Adipogenesis
• Extraocular muscle enlargement

The enlarged muscles are particularly important in:

DON.

Who Is at Greater Risk

DON is more likely in patients with:

• Older age
• Male sex
• Smoking
• Severe extraocular muscle enlargement
• Diabetes
• Active TED
• Poor thyroid control

A particularly important phenotype is:

Severe muscle enlargement with relatively little proptosis.

Why Minimal Proptosis Can Be Dangerous

Marked proptosis can partially decompress orbital pressure anteriorly.

In contrast, some patients have:

• Large extraocular muscles
• Tight orbital septum
• Crowded apex

without dramatic forward displacement of the globe.

Thus:

Absence of severe proptosis does not exclude DON.

This is a classic examination trap.

Typical Patient Complaints

Patients may report:

• Reduced vision
• Loss of color intensity
• “Washed-out” colors
• Reduced contrast
• Visual-field loss
• Diplopia
• Orbital pressure
• Pain with eye movement

Some patients notice very little initially despite significant optic nerve dysfunction.

Why Color Vision Is So Important

One of the earliest clues to DON may be:

Reduced color saturation

particularly red desaturation.

Color vision may deteriorate before substantial Snellen visual acuity loss.

Testing can include:

• Ishihara plates
• Hardy-Rand-Rittler plates
• Comparison of red saturation between eyes

Visual Acuity Findings

Visual acuity may range from:

• Normal
• Mildly reduced
• Profoundly reduced

A normal Snellen acuity does:

Not completely exclude early DON.

Therefore optic nerve assessment should incorporate:

• Color vision
• Pupils
• Visual fields
• Imaging
• Clinical course

Pupillary Examination

An:

RAPD

strongly supports asymmetric optic nerve dysfunction.

However, DON is commonly:

Bilateral

so a patient with symmetric bilateral disease may have:

• No RAPD

despite significant optic neuropathy.

Visual-Field Abnormalities

Field loss is variable.

Possible defects include:

• Central scotoma
• Cecocentral defect
• Paracentral defects
• Arcuate abnormalities
• Altitudinal defects
• Generalized depression

There is no single pathognomonic field pattern.

Optic Disc Appearance

The optic disc may show:

• Normal appearance
• Mild edema
• Hyperemia
• Pallor in chronic disease

An important point is:

A normal optic disc does not exclude DON.

Most compression occurs posteriorly at the orbital apex.

Other TED Findings That Support the Diagnosis

Patients commonly have some combination of:

• Upper-lid retraction
• Lid lag
• Proptosis
• Chemosis
• Conjunctival injection
• Caruncular inflammation
• Restrictive strabismus
• Exposure keratopathy

However, severe external inflammation is not required for DON.

Motility Pattern

Extraocular muscle enlargement commonly affects:

• Inferior rectus
• Medial rectus
• Superior rectus/levator complex
• Lateral rectus less commonly

Typical consequences include:

• Limited elevation
• Limited abduction
• Restrictive hypotropia
• Esotropia

Why Diplopia Occurs

Diplopia results from:

Mechanical restriction

rather than a cranial nerve palsy.

Affected muscles become:

• Edematous during active disease
• Fibrotic during inactive disease

Intraocular Pressure

IOP may be elevated because of:

• Orbital congestion
• Tight inferior rectus
• Elevated episcleral venous pressure
• Steroid treatment

IOP should generally be measured in:

Primary gaze

because forced upgaze can artificially raise the pressure.

Essential Clinical Examination

A patient with suspected DON should undergo:

• Visual acuity
• Pupillary examination
• Color vision
• Contrast sensitivity when available
• Automated visual field
• Ocular motility
• Alignment
• Corneal assessment
• Exophthalmometry
• IOP
• Dilated optic nerve examination

Laboratory Assessment

Useful thyroid studies include:

• TSH
• Free T4
• T3 when appropriate
• TRAb
• TSI

The presence of thyroid autoantibodies supports TED.

Negative antibodies do:

Not absolutely exclude the diagnosis.

Imaging Is Essential When DON Is Suspected

Orbital imaging is generally required.

Preferred studies are:

• CT orbit
• MRI orbit

The main purpose is to assess:

Orbital apex crowding.

Classic CT Findings

CT commonly demonstrates:

• Extraocular muscle belly enlargement
• Relative tendon sparing
• Apical crowding
• Compression of surrounding orbital fat
• Proptosis
• Increased orbital fat in some patients

Inferior and medial recti are often most enlarged.

The “Muscle Index”

Older literature sometimes quantified apical crowding with a:

Muscle index

based on the proportion of orbital width occupied by enlarged muscles.

It can support the diagnosis but is not required routinely.

Clinical and imaging correlation is more important than a single numeric cutoff.

Apical Crowding

The most important radiologic clue is:

Loss of normal fat around the optic nerve at the orbital apex because of enlarged rectus muscles.

This finding strongly supports compressive DON.

Why MRI Can Help

MRI provides superior soft-tissue contrast and may demonstrate:

• Muscle enlargement
• Apical compression
• Optic nerve changes
• Orbital fat expansion

T2/STIR signal can help estimate:

Inflammatory activity.

Tendon Sparing

TED classically causes:

Muscle belly enlargement with relative sparing of the tendons.

This contrasts with idiopathic orbital myositis, in which tendon involvement is more common.

The distinction is useful but:

Not absolute.

Important Differential Diagnoses

Consider:

• Optic neuritis
• Ischemic optic neuropathy
• Compressive orbital tumor
• Orbital lymphoma
• Idiopathic orbital inflammation
• Sarcoidosis
• IgG4-related orbital disease
• Orbital metastasis
• Carotid-cavernous fistula
• Glaucoma

Distinguishing DON From Optic Neuritis

Optic neuritis more commonly shows:

• Pain with eye movement
• Younger age
• Rapid visual loss
• MRI optic nerve enhancement

DON instead occurs in the setting of:

• TED
• Enlarged extraocular muscles
• Apical crowding

Distinguishing DON From Glaucoma

Both may produce:

• Optic neuropathy
• Visual-field loss

DON is suggested by:

• Reduced color vision
• Rapid progression
• Apical compression
• TED signs

Glaucoma more typically causes:

• Characteristic cupping
• RNFL loss
• Corresponding arcuate field defects

Distinguishing TED From Myasthenia

Myasthenia gravis can coexist with autoimmune thyroid disease.

Consider MG when there is:

• Fluctuating diplopia
• Ptosis
• Fatigability
• Variable motility pattern

MG does not typically produce:

• Proptosis
• Extraocular muscle enlargement
• Apical crowding

Activity vs Severity

DON represents:

Sight-threatening severity

regardless of the Clinical Activity Score.

A patient may have optic neuropathy even with a relatively low:

CAS

so a low CAS should never delay treatment.

Immediate Management Goal

The priority is:

Rapid decompression of the optic nerve and suppression of orbital inflammation before irreversible axonal loss occurs.

Treatment should not be delayed while waiting for thyroid function to normalize.

First-Line Emergency Treatment

Current standard initial therapy generally consists of:

High-dose intravenous methylprednisolone

when there is no major contraindication.

A common approach uses:

500–1,000 mg IV methylprednisolone daily for 3 consecutive days

with the exact regimen determined by local protocol and patient factors.

Why IV Steroids Are Preferred

IV glucocorticoids:

• Act rapidly
• Reduce orbital edema
• Reduce muscle swelling
• Can improve optic nerve compression

They are generally preferred over prolonged oral prednisone for:

Acute DON.

What Happens After the First Steroid Course

The patient should be reassessed rapidly for:

• Visual acuity
• Color vision
• Pupils
• Visual fields
• Clinical signs

If optic nerve function fails to improve adequately:

Urgent orbital decompression is indicated.

When Decompression Should Not Be Delayed

Proceed urgently when there is:

• Poor or absent steroid response
• Steroid contraindication
• Progressive visual loss
• Severe apical compression
• Recurrent DON despite medical therapy

The goal is to create additional orbital volume and relieve:

Apical optic nerve pressure.

Which Orbital Walls Are Decompressed

For DON, decompression often targets the:

• Medial orbital wall
• Orbital floor

because these directly relieve apical crowding.

Lateral wall decompression may be added depending on:

• Anatomy
• Proptosis
• Surgical strategy

Why Medial Decompression Is Important

The medial wall provides access to the crowded orbital apex and allows enlarged medial rectus tissue to displace into the:

Ethmoid sinus

thereby reducing pressure on the optic nerve.

Complications of Orbital Decompression

Potential complications include:

• New or worsened diplopia
• Infraorbital numbness
• Sinus complications
• Globe displacement
• CSF leak, rarely
• Orbital hemorrhage
• Rare visual loss

Despite these risks, decompression is potentially sight-saving in DON.

Role of Teprotumumab

Teprotumumab, an IGF-1R inhibitor, is an important treatment for active TED and can substantially reduce:

• Proptosis
• Diplopia
• Soft-tissue inflammation

Case series suggest potential benefit in DON, but:

It should not replace urgent IV glucocorticoids and/or surgical decompression when vision is acutely threatened.

DON requires treatment with therapies capable of rapidly protecting the optic nerve.

Role of Mycophenolate

Mycophenolate is useful for:

Active moderate-to-severe TED

and may reduce inflammatory relapse.

However, it is not generally used as the sole emergency treatment for:

Acute DON.

Role of Orbital Radiotherapy

Orbital radiotherapy may reduce:

• Extraocular muscle inflammation
• Motility restriction

but its effect is relatively slow.

It is therefore:

Not the primary emergency treatment for acute DON.

It may be used as an adjunct in selected active disease.

Important Modern Correction About Radiation

Older management sometimes placed radiation alongside steroids and decompression for acute optic neuropathy.

Modern practice generally prioritizes:

IV glucocorticoids → rapid assessment → orbital decompression when response is inadequate

rather than relying on radiotherapy to rescue an acutely threatened optic nerve.

Role of Rituximab and Other Biologics

Agents such as:

• Rituximab
• Tocilizumab

may be useful in selected refractory active TED.

They are not established first-line rescue treatments for:

Acute DON.

Smoking Cessation

Smoking cessation is essential because smoking increases:

• TED incidence
• Disease activity
• Severity
• Treatment resistance

It is the most important modifiable risk factor.

Thyroid Control

Patients should be maintained as close to:

Euthyroid

as possible.

Both:

• Hyperthyroidism
• Hypothyroidism

may worsen TED.

Management should be coordinated with:

Endocrinology.

Radioactive Iodine Considerations

Radioactive iodine can worsen TED, particularly in patients with:

• Active disease
• Smoking
• High TRAb levels

Glucocorticoid prophylaxis may be appropriate when radioactive iodine is used in high-risk patients.

In established sight-threatening TED, radioactive iodine is generally not the immediate management priority.

Corneal Protection

DON may coexist with severe exposure.

Management can include:

• Preservative-free tears
• Lubricating ointment
• Moisture chamber
• Eyelid taping

Severe epithelial breakdown may require:

• Temporary tarsorrhaphy
• Other protective procedures

Management of Diplopia During Active Disease

Temporary measures include:

• Fresnel prism
• Occlusion
• Ground-in prism for small stable deviations

Definitive strabismus surgery is generally postponed until:

TED is inactive and alignment is stable.

Definitive Rehabilitative Surgery

Once disease is stable, the usual order is:

Orbital decompression → strabismus surgery → eyelid surgery

because each procedure can alter subsequent anatomy.

Monitoring During Acute DON

Patients require very close assessment.

Important parameters include:

• Visual acuity
• Color vision
• RAPD
• Visual fields
• Optic nerve appearance
• Motility
• Corneal status

Clinical reassessment after treatment should occur:

Promptly, often within days rather than weeks.

Steroid Safety

High-dose IV corticosteroids can cause:

• Hyperglycemia
• Hypertension
• Infection
• Psychiatric effects
• Cardiovascular events
• Hepatotoxicity

Very high cumulative methylprednisolone exposure should be avoided.

Liver and Cardiovascular Assessment

Before substantial IV steroid treatment, consider:

• Liver function
• Cardiovascular history
• Blood pressure
• Glucose
• Infection risk

Treatment should still proceed urgently when vision is threatened, while managing systemic risk appropriately.

Why Bisphosphonates Are Not Automatically Required

Older texts recommended oral bisphosphonates routinely for steroid treatment.

Modern osteoporosis prevention is individualized according to:

• Steroid dose and duration
• Age
• Bone density
• Fracture risk
• Calcium/vitamin D status

Brief emergency IV steroid courses do not automatically require bisphosphonate therapy.

Expected Response

When recognized early, treatment can produce substantial recovery in:

• Visual acuity
• Color vision
• Visual fields

Recovery may begin rapidly after:

• IV steroids
• Decompression

Why Vision May Not Fully Recover

Permanent damage can occur if compression causes:

• Axonal loss
• Ischemia
• Optic atrophy

Delayed treatment is therefore associated with worse prognosis.

Chronic Optic Atrophy

Late disease may show:

• Pale optic disc
• Persistent field defects
• Reduced color vision
• Permanent acuity loss

Once established, optic atrophy is:

Irreversible.

Features Suggesting Poorer Prognosis

Concern is greater with:

• Severe initial visual loss
• Marked color vision loss
• Long symptom duration
• Optic disc pallor
• Severe apical crowding
• Delayed decompression
• Recurrent DON

High-Yield Takeaways

• Thyroid optic neuropathy is more commonly termed dysthyroid optic neuropathy (DON) and is a sight-threatening complication of thyroid eye disease.
• The usual mechanism is compression of the optic nerve at the orbital apex by enlarged extraocular muscles.
• DON can occur in hyperthyroid, euthyroid, or hypothyroid patients.
• Important risk factors include smoking, older age, male sex, diabetes, and marked muscle enlargement.
• Severe proptosis is not required; patients with relatively little proptosis but severe apical crowding may be at particularly high risk.
• Early clues include color desaturation, reduced contrast, visual-field abnormalities, and decreased visual acuity.
• An RAPD may be absent when disease is bilaterally symmetric.
• A normal optic disc does not exclude DON because compression usually occurs posteriorly.
• Orbital CT or MRI should demonstrate extraocular muscle enlargement and apical crowding.
• TED classically causes muscle-belly enlargement with relative tendon sparing.
• DON is classified as sight-threatening TED regardless of CAS; a low activity score should not delay treatment.
• Acute treatment generally begins with high-dose IV methylprednisolone.
• If optic nerve function does not improve rapidly, or steroids are contraindicated, urgent orbital decompression is required.
• For DON, decompression commonly targets the medial wall and orbital floor to relieve apical crowding.
• Orbital radiotherapy is too slow to be relied upon as the main emergency rescue treatment for acute DON.
• Teprotumumab is highly relevant to active TED and may help selected DON cases, but it does not replace urgent steroids or decompression when vision is acutely threatened.
• Smoking cessation and maintenance of a euthyroid state are important adjuncts but should never delay optic nerve rescue.
• Patients with suspected DON require rapid neuro-ophthalmic/orbital specialist assessment and close follow-up over days, not routine months-long intervals.
• Prognosis is often good when treatment is early, but established optic atrophy and axonal loss are permanent.

Ophthalmology – Preseptal Cellulitis

Basics

Description

Preseptal cellulitis, also called periorbital cellulitis, is an infection of the eyelid and periocular soft tissues located:

Anterior to the orbital septum

By definition, there is no infection of the:

• Orbital fat
• Extraocular muscles
• Optic nerve
• Other postseptal orbital structures

The most important clinical task is:

Distinguishing preseptal cellulitis from orbital cellulitis

because orbital cellulitis can threaten both:

• Vision
• Life

Key Clinical Distinction

Typical preseptal cellulitis causes:

• Eyelid erythema
• Eyelid edema
• Warmth
• Tenderness

while preserving:

• Normal visual acuity
• Normal color vision
• Normal pupils
• Full, painless ocular motility
• No proptosis

Any orbital sign should prompt concern for:

Orbital cellulitis until proven otherwise.

Orbital Cellulitis Red Flags

Findings concerning for postseptal extension include:

• Pain with eye movements
• Restricted extraocular movements
• Diplopia
• Proptosis
• Reduced visual acuity
• Reduced color vision
• RAPD
• Optic disc edema
• Severe chemosis
• Increasing ophthalmoplegia
• Severe headache or neurologic symptoms

These findings require urgent:

• Imaging
• IV antibiotics
• Ophthalmology/ENT assessment
• Usually hospitalization

Epidemiology

Preseptal cellulitis occurs most commonly in:

Children

but may occur at any age.

It is particularly common after:

• Upper respiratory infection
• Local eyelid infection
• Sinusitis
• Trauma

The incidence of Haemophilus influenzae type b disease has fallen substantially where:

Hib vaccination is routine.

Risk Factors

Important risk factors include:

• Sinusitis
• Hordeolum
• Infected chalazion
• Blepharitis
• Impetigo
• Dacryocystitis
• Dacryoadenitis
• Insect bite
• Animal bite
• Eyelid trauma
• Periocular surgery
• Dental infection
• Retained foreign body
• Diabetes mellitus
• Immunosuppression

Pathophysiology

The orbital septum is a fibrous barrier extending from the:

• Orbital rim periosteum

to the:

• Tarsal plates

It separates superficial eyelid tissues from the orbital contents.

Preseptal infection remains anterior to this barrier.

Spread may occur through:

• Direct inoculation
• Adjacent skin infection
• Sinus disease
• Lacrimal infection
• Trauma

If infection crosses the septum:

Orbital cellulitis develops.

Etiology

Common Sources

Preseptal cellulitis may follow:

• Skin infection
• Hordeolum
• Chalazion with secondary infection
• Dacryocystitis
• Dacryoadenitis
• Sinusitis
• Trauma
• Insect bite
• Animal or human bite

Common Organisms

Common pathogens include:

• Staphylococcus aureus
• Streptococcus pyogenes
• Other streptococci
• Streptococcus pneumoniae

Depending on the source, infection may be:

• Monomicrobial
• Polymicrobial

MRSA

Community-acquired MRSA should be considered when there is:

• Purulent drainage
• Abscess
• Penetrating trauma
• Previous MRSA
• Household MRSA exposure
• High local prevalence

MRSA coverage should be determined partly by:

Local antimicrobial resistance patterns.

Haemophilus influenzae

Before widespread Hib vaccination, H. influenzae type b was a major cause of periocular cellulitis in children.

It is now much less common in fully immunized populations.

Risk increases with:

• Incomplete vaccination
• Immunocompromise

Bite-Related Infection

Animal or human bites can introduce:

• Anaerobes
• Pasteurella species
• Oral flora
• Staphylococci
• Streptococci

These generally require:

Broad-spectrum therapy with anaerobic coverage.

Fungal Infection

In immunocompromised patients, particularly those with:

• Poorly controlled diabetes
• Neutropenia
• Severe immunosuppression

consider invasive fungal disease such as:

• Mucormycosis
• Aspergillosis

Necrotic tissue, cranial neuropathy, or rapidly progressive disease is an emergency.

History

Ask about:

• Onset and progression of swelling
• Fever
• Pain
• Recent URI
• Sinus symptoms
• Dental infection
• Hordeolum/chalazion
• Dacryocystitis
• Trauma
• Insect bite
• Animal bite
• Periocular surgery
• Previous MRSA

Most importantly ask about:

• Pain with eye movements
• Diplopia
• Decreased vision
• Color desaturation
• Proptosis symptoms
• Severe headache
• Nausea/vomiting
• Neurologic symptoms

Physical Examination

Perform:

• Vital signs
• Visual acuity
• Pupillary examination
• Color vision when feasible
• Extraocular motility
• Proptosis assessment
• Slit-lamp examination
• Fundus examination when indicated

Evaluate the lids for:

• Erythema
• Edema
• Warmth
• Tenderness
• Fluctuance
• Skin wound
• Drainage
• Abscess

Typical Preseptal Cellulitis Examination

Expected findings include:

• Swollen erythematous eyelid
• Tender periocular skin
• Normal globe position
• Normal visual acuity
• Normal pupillary responses
• Full painless eye movements
• No optic neuropathy

Chemosis

Mild chemosis can occasionally occur with severe preseptal inflammation.

However, prominent chemosis combined with:

• Proptosis
• Motility restriction
• Pain with movement

strongly suggests orbital involvement.

Pediatric Examination

In young children, examination may be difficult because of:

• Eyelid swelling
• Distress
• Poor cooperation

If the clinician cannot confidently assess:

• Vision
• Pupils
• Eye movements
• Proptosis

there should be a low threshold for orbital imaging.

Trauma Considerations

With periocular trauma, exclude:

• Globe rupture
• Orbital foreign body
• Orbital fracture
• Retained organic material

If the eye cannot be adequately examined and significant globe injury is suspected:

Urgent ophthalmic evaluation and, when necessary, examination under anesthesia may be required.

Diagnosis

Preseptal cellulitis is primarily a:

Clinical diagnosis

Imaging is not required for every uncomplicated case.

Laboratory Testing

Routine blood testing is usually unnecessary in a:

• Mild
• Localized
• Nontoxic

patient.

Consider:

• CBC
• Blood cultures

when there is:

• Fever
• Systemic toxicity
• Severe infection
• Immunocompromise
• Very young age
• Hospital admission

Blood cultures have relatively low yield in uncomplicated cases.

Wound and Drainage Cultures

If there is:

• Purulent drainage
• Open wound
• Abscess

obtain material for:

• Gram stain
• Bacterial culture
• Susceptibility testing

This is particularly useful when:

• MRSA is possible
• Initial treatment fails

Imaging

When CT or MRI Is Indicated

Orbital imaging should be obtained when there is:

• Painful or restricted eye movement
• Proptosis
• Decreased vision
• RAPD
• Significant chemosis
• Severe systemic illness
• Neurologic findings
• Concern for orbital abscess
• Concern for intracranial extension
• Significant trauma
• Possible orbital foreign body
• Inability to adequately examine the eye
• Failure to improve after approximately 24–48 hours of appropriate treatment

CT

Contrast-enhanced CT of the orbits and paranasal sinuses is commonly used because it is:

• Rapid
• Widely available
• Excellent for sinus disease
• Useful for abscess and bony anatomy

MRI

MRI provides superior soft-tissue detail and is especially useful when there is concern for:

• Cavernous sinus thrombosis
• Intracranial extension
• Orbital apex involvement

but it is slower and may require sedation in children.

Important Imaging Principle

A straightforward case with:

• Normal vision
• Full painless motility
• No proptosis
• Mild localized eyelid cellulitis
• Reliable follow-up

usually does not require immediate CT.

Differential Diagnosis

Important differentials include:

• Orbital cellulitis
• Allergic eyelid edema
• Contact dermatitis
• Insect-bite reaction
• Hordeolum
• Chalazion
• Dacryocystitis
• Dacryoadenitis
• Viral conjunctivitis
• Herpes simplex blepharitis
• Herpes zoster ophthalmicus
• Erysipelas
• Necrotizing fasciitis
• Idiopathic orbital inflammation
• Cavernous sinus thrombosis

Preseptal vs Orbital Cellulitis

Preseptal Cellulitis

• Eyelid swelling
• Eyelid erythema
• Normal vision
• No RAPD
• Full ocular movements
• No pain with movements
• No proptosis

Orbital Cellulitis

• Proptosis
• Painful/restricted ocular motility
• Diplopia
• Possible reduced vision
• Possible RAPD
• Possible optic disc edema
• Often associated with sinusitis
• Risk of abscess and intracranial spread

This distinction is the central examination point.

Allergic Eyelid Edema

Allergic disease more often causes:

• Bilateral swelling
• Itching
• Minimal tenderness
• No fever

Preseptal cellulitis is more likely:

• Unilateral
• Warm
• Tender
• Erythematous

Necrotizing Fasciitis

Consider necrotizing infection when there is:

• Severe pain out of proportion
• Rapid progression
• Skin discoloration
• Bullae
• Crepitus
• Tissue necrosis
• Systemic toxicity

This requires:

Immediate surgical and broad-spectrum antimicrobial management.

Treatment Principles

Treatment depends on:

• Age
• Severity
• Systemic symptoms
• Immune status
• Likely source
• Ability to take oral medication
• Reliability of follow-up
• Certainty that the orbit is uninvolved

Mild Uncomplicated Disease

A well-appearing patient with clear preseptal disease can usually be managed with:

Oral antibiotics and close follow-up.

First-Line Oral Therapy

A common first-line choice is:

Amoxicillin–clavulanate

because it covers many:

• Streptococci
• MSSA
• Respiratory pathogens
• Anaerobes

especially when sinus or bite-related flora are possible.

Dose should be:

Age- and weight-adjusted according to local pediatric or adult guidelines.

MRSA Coverage

When MRSA coverage is required, options may include:

• Trimethoprim–sulfamethoxazole
• Clindamycin when local susceptibility is adequate
• Doxycycline in appropriate older patients

However:

TMP-SMX and doxycycline have unreliable group A streptococcal coverage.

Therefore they are commonly combined with a beta-lactam such as:

• Amoxicillin–clavulanate
• Amoxicillin
• Cephalexin

when streptococcal coverage is also needed.

Penicillin Allergy

Management depends on the nature of the allergy.

Options may include:

• Clindamycin
• Selected cephalosporins in patients without severe immediate hypersensitivity
• Other regimens based on local resistance patterns

There is no single universal substitute suitable for every allergy history.

Antibiotic Duration

For uncomplicated disease responding promptly, treatment is commonly:

Approximately 5–7 days

with extension when:

• Response is slow
• Infection is more severe
• Associated sinusitis requires longer treatment

Older fixed 7–10-day courses are not always necessary.

Supportive Treatment

Additional measures may include:

• Warm compresses
• Analgesia
• Treatment of the source infection

Examples:

• Hordeolum
• Sinusitis
• Dacryocystitis
• Skin wound

Abscess

A localized eyelid abscess may require:

Incision and drainage

especially when:

• Fluctuant
• Large
• Poorly responsive to antibiotics

Drainage material should be cultured.

Corticosteroids

Routine systemic or topical corticosteroids are:

Not standard treatment for uncomplicated preseptal cellulitis.

They may obscure clinical progression.

Any use should be highly selective and generally after:

• Adequate antimicrobial treatment
• Exclusion of uncontrolled infection
• Specialist assessment

Hospital Admission

Admission and IV antibiotics should be considered when there is:

• Possible orbital cellulitis
• Systemic toxicity
• Rapid progression
• Severe infection
• Immunocompromise
• Inability to take oral medication
• Unreliable follow-up
• Failure of outpatient treatment
• Very young infant with concerning features
• Inability to adequately assess orbital status

Pediatric Admission

Older teaching recommended automatic hospitalization for every child under 1 year.

Modern management is more individualized.

However, infants and very young children warrant a:

Low threshold for admission

because:

• Examination can be difficult
• Deterioration may be rapid
• Follow-up reliability is critical

Intravenous Antibiotics

Potential IV regimens include:

• Ampicillin–sulbactam
• Ceftriaxone or another appropriate cephalosporin in selected settings

Add:

• Vancomycin

when MRSA or severe resistant gram-positive infection is a concern.

Exact choice depends on:

• Local antibiogram
• Age
• Allergy history
• Source of infection
• Culture results

Orbital Cellulitis Uncertainty

If the distinction between preseptal and orbital cellulitis is uncertain:

Manage as possible orbital cellulitis until clarified.

This may include:

• Hospital admission
• Imaging
• IV antibiotics
• Ophthalmology consultation
• ENT consultation

Sinusitis

ENT involvement is particularly useful when there is:

• Significant bacterial sinusitis
• Subperiosteal abscess
• Recurrent disease
• Failure of medical therapy

Dacryocystitis

If preseptal cellulitis arises from acute dacryocystitis:

• Treat systemic infection
• Avoid probing during the acute inflammatory phase
• Address underlying nasolacrimal obstruction after infection resolves

Follow-Up

Outpatients should generally be reassessed within:

24–48 hours

rather than automatically requiring daily visits in every mild case.

Earlier review is appropriate when:

• Child is young
• Swelling is severe
• Diagnosis is uncertain
• MRSA is suspected
• Systemic symptoms are present

Expected Response

Appropriate antibiotic therapy should usually produce:

• Reduced fever
• Reduced tenderness
• Decreased erythema/swelling

within approximately:

24–48 hours

Failure to Improve

Failure to improve should prompt reassessment for:

• Orbital cellulitis
• Abscess
• Resistant organism
• Retained foreign body
• Incorrect diagnosis
• Inadequate source control
• Invasive fungal infection in susceptible patients

Imaging is often warranted at this point.

Pediatric Amblyopia

Severe prolonged eyelid swelling can rarely obstruct the visual axis sufficiently to cause:

Deprivation amblyopia

in very young children.

Therefore prolonged complete eyelid closure deserves prompt management and visual monitoring.

Patient Education

Patients or caregivers should seek urgent reassessment for:

• Pain with eye movement
• New limitation of eye movement
• Proptosis
• Diplopia
• Reduced vision
• Increasing swelling
• Persistent fever
• Severe headache
• Vomiting
• Lethargy or neurologic symptoms

Prognosis

With prompt appropriate treatment:

Prognosis is excellent.

Most uncomplicated cases resolve completely without ocular sequelae.

Complications

Potential complications include progression to:

• Orbital cellulitis
• Subperiosteal abscess
• Orbital abscess
• Cavernous sinus thrombosis
• Meningitis
• Intracranial abscess
• Sepsis

In young children:

• Deprivation amblyopia from prolonged lid occlusion is possible but uncommon.

Ophthalmology Pearls

• Preseptal cellulitis is infection anterior to the orbital septum; orbital cellulitis is postseptal and potentially vision- and life-threatening.
• The hallmark of uncomplicated preseptal cellulitis is eyelid erythema and edema with normal vision, full painless motility, and no proptosis.
• Pain with eye movements, ophthalmoplegia, proptosis, reduced vision, or RAPD should be treated as orbital cellulitis until proven otherwise.
• Mild uncomplicated disease usually does not require routine CT imaging.
• Image when orbital involvement is suspected, examination is unreliable, significant trauma/foreign body is possible, or the patient fails to improve within 24–48 hours.
• Amoxicillin–clavulanate is a common first-line oral treatment for uncomplicated disease.
• If MRSA coverage is needed, remember that TMP-SMX and doxycycline do not reliably cover group A streptococcus, so additional streptococcal coverage may be necessary.
• Obtain cultures from purulent drainage or abscesses, not routinely from every patient.
• Routine blood cultures are usually unnecessary in mild uncomplicated disease but are appropriate in febrile, toxic, severely ill, or immunocompromised patients.
• Routine corticosteroids are not standard therapy for uncomplicated preseptal cellulitis.
• Infants and very young children warrant a low threshold for imaging and hospitalization, but age alone does not mandate admission in every modern protocol.
• Failure to improve should trigger reconsideration of orbital cellulitis, abscess, resistant organisms, retained foreign body, or an alternative diagnosis.
• When in doubt between preseptal and orbital cellulitis, manage as orbital cellulitis until the distinction is secure.

Key Clinical Distinction Typical preseptal cellulitis causes:  Eyelid erythema Eyelid edema Warmth Tenderness  while preserving:  Normal visual acuity Normal color vision Normal pupils Full, painless ocular motility No proptosis  Any orbital sign should prompt concern for: Orbital cellulitis until proven otherwise.

Orbital Cellulitis Red Flags Findings concerning for postseptal extension include:  Pain with eye movements Restricted extraocular movements Diplopia Proptosis Reduced visual acuity Reduced color vision RAPD Optic disc edema Severe chemosis Increasing ophthalmoplegia Severe headache or neurologic symptoms  These findings require urgent:  Imaging IV antibiotics Ophthalmology/ENT assessment Usually hospitalization

Epidemiology Preseptal cellulitis occurs most commonly in: Children but may occur at any age. It is particularly common after:  Upper respiratory infection Local eyelid infection Sinusitis Trauma  The incidence of Haemophilus influenzae type b disease has fallen substantially where: Hib vaccination is routine.

Risk Factors Important risk factors include:  Sinusitis Hordeolum Infected chalazion Blepharitis Impetigo Dacryocystitis Dacryoadenitis Insect bite Animal bite Eyelid trauma Periocular surgery Dental infection Retained foreign body Diabetes mellitus Immunosuppression

Pathophysiology The orbital septum is a fibrous barrier extending from the:  Orbital rim periosteum  to the:  Tarsal plates  It separates superficial eyelid tissues from the orbital contents. Preseptal infection remains anterior to this barrier. Spread may occur through:  Direct inoculation Adjacent skin infection Sinus disease Lacrimal infection Trauma  If infection crosses the septum: Orbital cellulitis develops.

Etiology Common Sources Preseptal cellulitis may follow:  Skin infection Hordeolum Chalazion with secondary infection Dacryocystitis Dacryoadenitis Sinusitis Trauma Insect bite Animal or human bite

Common Organisms Common pathogens include:  Staphylococcus aureus Streptococcus pyogenes Other streptococci Streptococcus pneumoniae  Depending on the source, infection may be:  Monomicrobial Polymicrobial

MRSA Community-acquired MRSA should be considered when there is:  Purulent drainage Abscess Penetrating trauma Previous MRSA Household MRSA exposure High local prevalence  MRSA coverage should be determined partly by: Local antimicrobial resistance patterns.

Haemophilus influenzae Before widespread Hib vaccination, H. influenzae type b was a major cause of periocular cellulitis in children. It is now much less common in fully immunized populations. Risk increases with:  Incomplete vaccination Immunocompromise

Bite-Related Infection Animal or human bites can introduce:  Anaerobes Pasteurella species Oral flora Staphylococci Streptococci  These generally require: Broad-spectrum therapy with anaerobic coverage.

Fungal Infection In immunocompromised patients, particularly those with:  Poorly controlled diabetes Neutropenia Severe immunosuppression  consider invasive fungal disease such as:  Mucormycosis Aspergillosis  Necrotic tissue, cranial neuropathy, or rapidly progressive disease is an emergency.

History Ask about:  Onset and progression of swelling Fever Pain Recent URI Sinus symptoms Dental infection Hordeolum/chalazion Dacryocystitis Trauma Insect bite Animal bite Periocular surgery Previous MRSA  Most importantly ask about:  Pain with eye movements Diplopia Decreased vision Color desaturation Proptosis symptoms Severe headache Nausea/vomiting Neurologic symptoms

Physical Examination Perform:  Vital signs Visual acuity Pupillary examination Color vision when feasible Extraocular motility Proptosis assessment Slit-lamp examination Fundus examination when indicated  Evaluate the lids for:  Erythema Edema Warmth Tenderness Fluctuance Skin wound Drainage Abscess

Typical Preseptal Cellulitis Examination Expected findings include:  Swollen erythematous eyelid Tender periocular skin Normal globe position Normal visual acuity Normal pupillary responses Full painless eye movements No optic neuropathy

Chemosis Mild chemosis can occasionally occur with severe preseptal inflammation. However, prominent chemosis combined with:  Proptosis Motility restriction Pain with movement  strongly suggests orbital involvement.

Pediatric Examination In young children, examination may be difficult because of:  Eyelid swelling Distress Poor cooperation  If the clinician cannot confidently assess:  Vision Pupils Eye movements Proptosis  there should be a low threshold for orbital imaging.

Trauma Considerations With periocular trauma, exclude:  Globe rupture Orbital foreign body Orbital fracture Retained organic material  If the eye cannot be adequately examined and significant globe injury is suspected: Urgent ophthalmic evaluation and, when necessary, examination under anesthesia may be required.

Diagnosis Preseptal cellulitis is primarily a: Clinical diagnosis Imaging is not required for every uncomplicated case.

Laboratory Testing Routine blood testing is usually unnecessary in a:  Mild Localized Nontoxic  patient. Consider:  CBC Blood cultures  when there is:  Fever Systemic toxicity Severe infection Immunocompromise Very young age Hospital admission  Blood cultures have relatively low yield in uncomplicated cases.

Wound and Drainage Cultures If there is:  Purulent drainage Open wound Abscess  obtain material for:  Gram stain Bacterial culture Susceptibility testing  This is particularly useful when:  MRSA is possible Initial treatment fails

Imaging When CT or MRI Is Indicated Orbital imaging should be obtained when there is:  Painful or restricted eye movement Proptosis Decreased vision RAPD Significant chemosis Severe systemic illness Neurologic findings Concern for orbital abscess Concern for intracranial extension Significant trauma Possible orbital foreign body Inability to adequately examine the eye Failure to improve after approximately 24–48 hours of appropriate treatment

CT Contrast-enhanced CT of the orbits and paranasal sinuses is commonly used because it is:  Rapid Widely available Excellent for sinus disease Useful for abscess and bony anatomy

MRI MRI provides superior soft-tissue detail and is especially useful when there is concern for:  Cavernous sinus thrombosis Intracranial extension Orbital apex involvement  but it is slower and may require sedation in children.

Important Imaging Principle A straightforward case with:  Normal vision Full painless motility No proptosis Mild localized eyelid cellulitis Reliable follow-up  usually does not require immediate CT.

Differential Diagnosis Important differentials include:  Orbital cellulitis Allergic eyelid edema Contact dermatitis Insect-bite reaction Hordeolum Chalazion Dacryocystitis Dacryoadenitis Viral conjunctivitis Herpes simplex blepharitis Herpes zoster ophthalmicus Erysipelas Necrotizing fasciitis Idiopathic orbital inflammation Cavernous sinus thrombosis

Preseptal vs Orbital Cellulitis Preseptal Cellulitis  Eyelid swelling Eyelid erythema Normal vision No RAPD Full ocular movements No pain with movements No proptosis  Orbital Cellulitis  Proptosis Painful/restricted ocular motility Diplopia Possible reduced vision Possible RAPD Possible optic disc edema Often associated with sinusitis Risk of abscess and intracranial spread  This distinction is the central examination point.

Allergic Eyelid Edema Allergic disease more often causes:  Bilateral swelling Itching Minimal tenderness No fever  Preseptal cellulitis is more likely:  Unilateral Warm Tender Erythematous

Necrotizing Fasciitis Consider necrotizing infection when there is:  Severe pain out of proportion Rapid progression Skin discoloration Bullae Crepitus Tissue necrosis Systemic toxicity  This requires: Immediate surgical and broad-spectrum antimicrobial management.

Treatment Principles Treatment depends on:  Age Severity Systemic symptoms Immune status Likely source Ability to take oral medication Reliability of follow-up Certainty that the orbit is uninvolved

Mild Uncomplicated Disease A well-appearing patient with clear preseptal disease can usually be managed with: Oral antibiotics and close follow-up.

First-Line Oral Therapy A common first-line choice is: Amoxicillin–clavulanate because it covers many:  Streptococci MSSA Respiratory pathogens Anaerobes  especially when sinus or bite-related flora are possible. Dose should be: Age- and weight-adjusted according to local pediatric or adult guidelines.

MRSA Coverage When MRSA coverage is required, options may include:  Trimethoprim–sulfamethoxazole Clindamycin when local susceptibility is adequate Doxycycline in appropriate older patients  However: TMP-SMX and doxycycline have unreliable group A streptococcal coverage. Therefore they are commonly combined with a beta-lactam such as:  Amoxicillin–clavulanate Amoxicillin Cephalexin  when streptococcal coverage is also needed.

Penicillin Allergy Management depends on the nature of the allergy. Options may include:  Clindamycin Selected cephalosporins in patients without severe immediate hypersensitivity Other regimens based on local resistance patterns  There is no single universal substitute suitable for every allergy history.

Antibiotic Duration For uncomplicated disease responding promptly, treatment is commonly: Approximately 5–7 days with extension when:  Response is slow Infection is more severe Associated sinusitis requires longer treatment  Older fixed 7–10-day courses are not always necessary.

Supportive Treatment Additional measures may include:  Warm compresses Analgesia Treatment of the source infection  Examples:  Hordeolum Sinusitis Dacryocystitis Skin wound

Abscess A localized eyelid abscess may require: Incision and drainage especially when:  Fluctuant Large Poorly responsive to antibiotics  Drainage material should be cultured.

Corticosteroids Routine systemic or topical corticosteroids are: Not standard treatment for uncomplicated preseptal cellulitis. They may obscure clinical progression. Any use should be highly selective and generally after:  Adequate antimicrobial treatment Exclusion of uncontrolled infection Specialist assessment

Hospital Admission Admission and IV antibiotics should be considered when there is:  Possible orbital cellulitis Systemic toxicity Rapid progression Severe infection Immunocompromise Inability to take oral medication Unreliable follow-up Failure of outpatient treatment Very young infant with concerning features Inability to adequately assess orbital status

Pediatric Admission Older teaching recommended automatic hospitalization for every child under 1 year. Modern management is more individualized. However, infants and very young children warrant a: Low threshold for admission because:  Examination can be difficult Deterioration may be rapid Follow-up reliability is critical

Intravenous Antibiotics Potential IV regimens include:  Ampicillin–sulbactam Ceftriaxone or another appropriate cephalosporin in selected settings  Add:  Vancomycin  when MRSA or severe resistant gram-positive infection is a concern. Exact choice depends on:  Local antibiogram Age Allergy history Source of infection Culture results

Orbital Cellulitis Uncertainty If the distinction between preseptal and orbital cellulitis is uncertain: Manage as possible orbital cellulitis until clarified. This may include:  Hospital admission Imaging IV antibiotics Ophthalmology consultation ENT consultation

Sinusitis ENT involvement is particularly useful when there is:  Significant bacterial sinusitis Subperiosteal abscess Recurrent disease Failure of medical therapy

Dacryocystitis If preseptal cellulitis arises from acute dacryocystitis:  Treat systemic infection Avoid probing during the acute inflammatory phase Address underlying nasolacrimal obstruction after infection resolves

Follow-Up Outpatients should generally be reassessed within: 24–48 hours rather than automatically requiring daily visits in every mild case. Earlier review is appropriate when:  Child is young Swelling is severe Diagnosis is uncertain MRSA is suspected Systemic symptoms are present

Expected Response Appropriate antibiotic therapy should usually produce:  Reduced fever Reduced tenderness Decreased erythema/swelling  within approximately: 24–48 hours

Failure to Improve Failure to improve should prompt reassessment for:  Orbital cellulitis Abscess Resistant organism Retained foreign body Incorrect diagnosis Inadequate source control Invasive fungal infection in susceptible patients  Imaging is often warranted at this point.

Pediatric Amblyopia Severe prolonged eyelid swelling can rarely obstruct the visual axis sufficiently to cause: Deprivation amblyopia in very young children. Therefore prolonged complete eyelid closure deserves prompt management and visual monitoring.

Patient Education Patients or caregivers should seek urgent reassessment for:  Pain with eye movement New limitation of eye movement Proptosis Diplopia Reduced vision Increasing swelling Persistent fever Severe headache Vomiting Lethargy or neurologic symptoms

Prognosis With prompt appropriate treatment: Prognosis is excellent. Most uncomplicated cases resolve completely without ocular sequelae.

Complications Potential complications include progression to:  Orbital cellulitis Subperiosteal abscess Orbital abscess Cavernous sinus thrombosis Meningitis Intracranial abscess Sepsis  In young children:  Deprivation amblyopia from prolonged lid occlusion is possible but uncommon.

Ophthalmology Pearls  Preseptal cellulitis is infection anterior to the orbital septum; orbital cellulitis is postseptal and potentially vision- and life-threatening. The hallmark of uncomplicated preseptal cellulitis is eyelid erythema and edema with normal vision, full painless motility, and no proptosis. Pain with eye movements, ophthalmoplegia, proptosis, reduced vision, or RAPD should be treated as orbital cellulitis until proven otherwise. Mild uncomplicated disease usually does not require routine CT imaging. Image when orbital involvement is suspected, examination is unreliable, significant trauma/foreign body is possible, or the patient fails to improve within 24–48 hours. Amoxicillin–clavulanate is a common first-line oral treatment for uncomplicated disease. If MRSA coverage is needed, remember that TMP-SMX and doxycycline do not reliably cover group A streptococcus, so additional streptococcal coverage may be necessary. Obtain cultures from purulent drainage or abscesses, not routinely from every patient. Routine blood cultures are usually unnecessary in mild uncomplicated disease but are appropriate in febrile, toxic, severely ill, or immunocompromised patients. Routine corticosteroids are not standard therapy for uncomplicated preseptal cellulitis. Infants and very young children warrant a low threshold for imaging and hospitalization, but age alone does not mandate admission in every modern protocol. Failure to improve should trigger reconsideration of orbital cellulitis, abscess, resistant organisms, retained foreign body, or an alternative diagnosis. When in doubt between preseptal and orbital cellulitis, manage as orbital cellulitis until the distinction is secure.

Orthopaedic Surgery - Wrist Pain

Basics

Wrist pain is a common clinical complaint with many possible causes, including:

Trauma

Overuse

Degenerative disease

Inflammatory disease

Infection

and

Neurologic disorders.

A detailed history and focused physical examination are essential for establishing the:

Correct diagnosis

and selecting appropriate:

Treatment.

History

Important historical features include:

Onset

Duration

Frequency

and

Exact location of pain.

Additional symptoms should be documented, including:

Swelling

Erythema

Clicking or snapping

Loss of motion

Numbness or tingling

Weakness

and relationship to:

Specific activities.

General Medical History

Ask about conditions that may contribute to wrist disease, including:

Rheumatoid arthritis

Osteoarthritis

Gout

Diabetes

Immunosuppression

and previous:

Infection or trauma.

Classification

Wrist pain can broadly be classified as:

Traumatic

Inflammatory

Degenerative

Infectious

or

Neurologic.

Common Causes

Frequent causes include:

Fracture

Fracture nonunion

Arthritis

Tendinitis or tendinopathy

and

Ligament injury.

Epidemiology

Wrist pain is particularly common among:

Athletes

and individuals involved in repetitive:

Upper-extremity activity.

Athletes

Historical studies have reported wrist pain in approximately:

32–73% of young athletes

depending on the sport and population studied.

Emergency Department Visits

In the United States, wrist injuries have historically accounted for approximately:

2.5% of emergency department visits.

Pregnancy Considerations

Pregnant patients with wrist discomfort accompanied by:

Numbness

or

Tingling

should be evaluated for:

Carpal tunnel syndrome.

Fluid retention during pregnancy can increase pressure within the:

Carpal tunnel.

Associated Conditions

Systemic disorders associated with wrist pain include:

Rheumatoid arthritis

Osteoarthritis

Gout

and

Infection.

Diagnostic Approach

The location of pain is highly useful for narrowing the:

Differential diagnosis.

Wrist pain can be categorized anatomically as:

Radial-sided

Dorsal

Ulnar-sided

Volar or palmar

or

Diffuse.

Radial-Sided Wrist Pain

Important causes include:

de Quervain tenosynovitis

Intersection syndrome

Scaphoid fracture

Scapholunate ligament injury

Wartenberg syndrome

and

Thumb CMC or STT arthritis.

de Quervain Tenosynovitis

de Quervain disease is a stenosing tenosynovitis involving the:

First dorsal compartment.

The affected tendons are:

Abductor pollicis longus

and

Extensor pollicis brevis.

Typical History

Patients often report repetitive:

Thumb

or

Wrist activity.

Pain is localized near the:

Radial styloid.

Eichhoff / Finkelstein-Type Maneuver

With the thumb flexed into the palm and the wrist moved into:

Ulnar deviation

sharp pain over the first dorsal compartment supports the diagnosis.

The commonly performed thumb-in-fist maneuver is more accurately termed the:

Eichhoff test.

Alternative Provocative Testing

Wrist hyperflexion combined with thumb abduction may also reproduce:

First-compartment pain.

Intersection Syndrome

Intersection syndrome is an overuse disorder occurring where the:

First dorsal compartment tendons

cross the:

Second dorsal compartment tendons.

Location

Pain is typically located approximately:

4 cm proximal to the dorsal wrist.

Cause

It is usually associated with repetitive:

Wrist extension

and

Forearm motion.

Scaphoid Fracture

Patients typically report trauma, especially:

A fall on an outstretched hand.

Examination

Suggestive findings include tenderness at the:

Anatomic snuffbox

Scaphoid tubercle

and pain with:

Axial compression of the thumb ray.

Active thumb motion may also produce:

Pain.

Scapholunate Ligament Injury

Scapholunate ligament injury can produce:

Radial-dorsal wrist pain

and

Mechanical instability.

Watson Test

The:

Scaphoid shift or Watson test

is used to assess:

Scapholunate instability.

Pain, abnormal scaphoid translation, or a reproducible:

Clunk

may support the diagnosis.

Definitive Diagnosis

When uncertainty remains, wrist:

Arthroscopy

remains the most definitive method of directly evaluating the:

Scapholunate ligament.

Wartenberg Syndrome

Wartenberg syndrome results from irritation of the:

Superficial radial sensory nerve.

Cause

Mechanical compression can occur from:

Watches

Bracelets

or other constrictive objects.

Symptoms

Patients experience:

Burning

Numbness

or

Tingling

over the:

Dorsoradial wrist and hand.

Thumb CMC and STT Arthritis

Arthritis involving the:

First carpometacarpal joint

or

Scaphotrapeziotrapezoid joint

can cause radial-sided wrist pain.

Grind Test

A positive:

CMC grind test

supports symptomatic thumb:

CMC arthritis.

Dorsal Wrist Pain

Important causes include:

Extensor tenosynovitis

Ganglion cyst

and other dorsal:

Tendon or ligament disorders.

Extensor Tenosynovitis

Patients typically report:

Dorsal wrist pain

that may radiate:

Proximally

or

Distally.

Cause

The condition is often associated with:

Repetitive activity

and

Overuse.

Examination

Pain may occur with:

Wrist flexion

Wrist extension

and particularly:

Resisted extension.

Synovial Thickening

In some cases, thickened extensor synovium can be palpated during:

Wrist motion.

Ganglion Cyst

A ganglion cyst is the most common mass found on the:

Dorsal wrist.

Origin

Many dorsal ganglia arise near the:

Scapholunate ligament.

Examination

Ganglion cysts are often:

Mobile

and may:

Transilluminate.

Their size may change:

Over time.

Imaging of Ganglion Cyst

Diagnosis is usually clinical.

If uncertain, or if the lesion is in an unusual location,:

Ultrasound

or

MRI

may be useful.

Ulnar-Sided Wrist Pain

Important causes include:

Distal radioulnar joint instability or arthritis

FCU tendinopathy

ECU tendinopathy

Hook of hamate fracture

TFCC tear

Ulnocarpal impaction

and

Lunotriquetral ligament injury.

Distal Radioulnar Joint Instability

Pain is usually localized over the:

Distal radioulnar joint

and is worsened by:

Pronation

and

Supination.

DRUJ Examination

Instability may be assessed by translating the:

Ulna

relative to a stabilized:

Radius.

Piano-Key Sign

Abnormal mobility of the distal ulna may produce a:

Piano-key sign.

DRUJ Imaging

Radiographs may demonstrate abnormal:

Distal radioulnar spacing or alignment.

If radiographs are inconclusive,:

CT

can help evaluate:

DRUJ congruity and instability.

DRUJ Arthritis

Degenerative changes may include:

Joint-space narrowing

Subchondral sclerosis

and

Osteophytes.

Flexor Carpi Ulnaris Tendinopathy

FCU tendinopathy produces pain near the:

Volar-ulnar wrist.

Examination

Pain is typically reproduced by:

Resisted wrist flexion

and

Ulnar deviation.

Extensor Carpi Ulnaris Tendinopathy

ECU tendinopathy causes pain along the:

Dorsal-ulnar wrist.

Examination

Pain may be reproduced by resisted:

Ulnar deviation

particularly with the forearm in:

Supination.

Hook of Hamate Fracture

This injury is particularly important in athletes such as:

Golfers

and

Racquet-sport players.

Mechanism

The injury may result from direct pressure or impact through:

A club

Bat

or

Racquet handle

against the:

Ulnar palm.

Examination

Tenderness is present over the:

Hook of the hamate.

Pain may also be reproduced with resisted flexion of the:

Ring and small fingers.

Imaging

A:

Carpal tunnel view

or CT may be needed because standard radiographs may fail to show the:

Fracture.

TFCC Tear

A triangular fibrocartilage complex tear typically causes:

Ulnar-sided wrist pain

often accompanied by:

Clicking.

TFCC Provocative Test

Pain may be reproduced by:

Axial loading

while rotating an:

Ulnar-deviated wrist.

Ulnocarpal Impaction

Ulnocarpal impaction syndrome causes pain with:

Grip

particularly when the forearm is:

Pronated.

Ulnar Variance

The condition is more common when there is:

Positive ulnar variance.

Lunotriquetral Ligament Injury

Lunotriquetral ligament injury may produce:

Ulnar-sided wrist pain

and

Instability.

LT Shuck Test

The lunate and triquetrum are moved in opposite directions.

Findings such as:

Pain

Crepitus

or excessive:

Translation

support an LT ligament injury.

Volar Wrist Pain

Common causes include:

Flexor tenosynovitis

Carpal tunnel syndrome

and

Volar ganglion cyst.

Flexor Tenosynovitis

Patients usually describe:

Palmar wrist pain

associated with repetitive:

Overuse.

Examination

Pain is worsened by:

Wrist motion

and

Resisted wrist flexion.

Symptoms may radiate:

Proximally

or

Distally.

Carpal Tunnel Syndrome

CTS is the most common:

Compression neuropathy of the upper extremity.

Symptoms

Patients may report:

Wrist discomfort

Numbness

Tingling

Clumsiness

and

Weakness.

Sensory Distribution

Symptoms typically involve the:

Thumb

Index finger

Middle finger

and

Radial half of the ring finger.

Nocturnal Symptoms

Patients frequently awaken at night with:

Numbness or paresthesias.

Provocative Tests

Useful maneuvers include:

Tinel sign

Phalen test

and

Flexion-compression testing.

Late CTS Findings

Advanced median neuropathy may produce:

Reduced sensation

and

Thenar atrophy.

Generalized Wrist Pain

Diffuse pain may result from:

Osteoarthritis

Inflammatory arthritis

or

Infection.

Osteoarthritis

Degenerative arthritis may affect the:

Radiocarpal

Intercarpal

or

CMC joints.

History

Patients may have a history of:

Previous trauma

or longstanding:

Degeneration.

Examination

Typical findings include:

Pain

Stiffness

Swelling

and

Reduced range of motion.

Osteoarthritis Radiographs

Common findings include:

Joint-space narrowing

Subchondral sclerosis

and

Osteophyte formation.

Inflammatory Arthritis

Inflammatory disorders such as:

Rheumatoid arthritis

may cause:

Synovitis

Tendon-sheath swelling

and later:

Joint deformity.

Inflammatory Arthritis Radiographs

Possible findings include:

Joint-space narrowing

Periarticular osteopenia

Bone erosions

and

Deformity.

Wrist Infection

Septic arthritis of the:

Radiocarpal joint

is uncommon but potentially destructive.

Risk Factors

Risk is increased in:

Immunocompromised patients

and individuals with a history of:

Intravenous drug use.

Signs of Infection

Possible findings include:

Severe pain

Swelling

Erythema

Warmth

and

Marked reduction in motion.

Pain With Motion

Severe pain with:

Passive and active wrist motion

is particularly concerning for:

Septic arthritis.

Laboratory Findings

Possible abnormalities include elevated:

White blood cell count

ESR

and

CRP.

Normal serum tests do not completely exclude:

Infection.

Joint Aspiration

When septic arthritis is suspected, the joint should be:

Aspirated urgently.

Synovial fluid should be sent for:

Cell count

Differential

Gram stain

and

Culture.

Synovial WBC

A very high synovial leukocyte count with a predominance of:

Neutrophils

strongly supports infection.

Historical thresholds such as:

>80,000 cells/µL with >75% polymorphonuclear cells

have been described, but no single value alone confirms or excludes:

Septic arthritis.

Laboratory Tests

Laboratory evaluation is most useful when:

Infection

or systemic inflammatory disease is suspected.

Infection Markers

Obtain:

CBC

ESR

and

CRP

when evaluating possible:

Septic arthritis.

Imaging

Plain Radiographs

Initial imaging usually includes:

PA

Lateral

and

Oblique wrist radiographs.

Scaphoid View

A dedicated:

Scaphoid view

is useful when a:

Scaphoid fracture

is suspected.

Carpal Tunnel View

A:

Carpal tunnel view

can improve visualization of the:

Hook of hamate.

MRI

MRI, preferably with high-resolution technique, may be useful for suspected:

TFCC

Scapholunate

or

Lunotriquetral ligament tears.

Limitations of MRI

MRI findings should be interpreted in combination with:

History

and

Physical examination

because incidental abnormalities can occur.

Differential Diagnosis

Radial-Sided Pain

Consider:

de Quervain tenosynovitis

Scaphoid fracture or nonunion

Scapholunate ligament injury

Thumb CMC arthritis

STT arthritis

Radiocarpal arthritis

and

Wartenberg syndrome.

Dorsal Pain

Consider:

Extensor tenosynovitis

Ganglion cyst

and

ECU tendinopathy.

Ulnar-Sided Pain

Consider:

DRUJ instability

FCU tendinopathy

ECU tendinopathy

Hook of hamate fracture

TFCC tear

Ulnocarpal impaction

and

Lunotriquetral ligament injury.

Volar Pain

Consider:

Flexor tenosynovitis

Carpal tunnel syndrome

and

Volar ganglion cyst.

Generalized Pain

Consider:

Osteoarthritis

Inflammatory arthritis

and

Infection.

Treatment

Treatment depends entirely on the:

Underlying diagnosis.

Tendinitis and Tenosynovitis

Initial treatment may include:

Rest

Activity modification

Cold therapy

Immobilization

and

NSAIDs.

Corticosteroid Injection

Selected persistent tendon-sheath disorders may benefit from:

Local corticosteroid injection.

Nondisplaced Fractures

Stable nondisplaced fractures are generally treated with:

Immobilization

and appropriate:

Analgesia.

Rheumatoid Arthritis

Rheumatoid wrist disease requires treatment of the underlying systemic:

Inflammatory disorder.

Management should be coordinated with a:

Rheumatologist.

Ganglion Cyst

Observation is appropriate for many asymptomatic:

Ganglion cysts.

Aspiration

Dorsal ganglia may be:

Aspirated

but recurrence is:

Common.

Excision

Surgical excision generally has a lower recurrence rate than:

Aspiration

but still carries risks of:

Stiffness

scar sensitivity

and

Recurrence.

Carpal Tunnel Syndrome

Mild to moderate CTS can initially be treated with:

Neutral-position wrist splinting

Activity modification

and selected:

Corticosteroid injection.

Role of Injection

Steroid injection may provide substantial:

Temporary symptom relief

and can delay or occasionally avoid:

Surgery.

It does not reliably provide permanent cure in all:

Patients.

Wrist Infection

Suspected septic wrist requires urgent:

Hospital-based treatment.

Aspiration and Cultures

Synovial fluid should be obtained for:

Gram stain

and

Culture

before antibiotics whenever this can be performed without delaying:

Treatment.

Antibiotics

After cultures are obtained,:

Intravenous antibiotics

should be started promptly.

Surgical Drainage

Many septic wrists require:

Arthroscopic or open irrigation and debridement.

Serial Aspiration

Repeated aspiration may be appropriate in selected:

Patients

when adequate drainage can be achieved and close monitoring is:

Available.

Rehabilitation After Infection

Once infection is controlled, early:

Range of motion

is important to minimize:

Joint stiffness.

Medication

First-line medication depends on the diagnosis.

Possible therapies include:

NSAIDs

Local corticosteroid injection

and

Intravenous antibiotics

for septic arthritis.

Surgery

Operative treatment is reserved for specific:

Structural or refractory conditions.

de Quervain Surgery

Persistent de Quervain disease despite adequate nonoperative management may require:

First dorsal compartment release.

Scaphoid Fracture Surgery

Displaced scaphoid fractures commonly require:

Internal fixation.

Selected nondisplaced fractures may be treated with:

Cast immobilization

or

Internal fixation

depending on location, patient factors, and functional demands.

DRUJ Instability

Persistent DRUJ instability may require:

Arthroscopy

TFCC repair

or open:

Reconstruction.

Fracture-Associated DRUJ Instability

If instability accompanies fractures of the:

Distal radius

or

Ulna

fracture fixation may be required.

Temporary:

DRUJ pinning

may be used in selected unstable injuries.

Hook of Hamate Fracture

Hook fractures have a relatively high risk of:

Nonunion.

Small Hook Fragment

A persistently symptomatic small fragment may be treated with:

Surgical excision.

Base Fracture

A fracture through the base of the hook may be treated with:

Open reduction and internal fixation

when appropriate.

Flexor Tenosynovitis

Chronic refractory flexor tendon adhesions or mechanical restriction may occasionally require:

Tenolysis

although treatment depends on the specific:

Pathology.

Carpal Tunnel Release

Surgical decompression is considered when:

Nonoperative treatment fails

or when advanced median nerve dysfunction is present.

Advanced CTS Findings

Indications include:

Persistent sensory loss

Thenar weakness or atrophy

and significant abnormalities on:

Nerve conduction studies or EMG.

Arthritis Surgery

Severe wrist arthritis that does not respond to conservative care may require:

Arthroplasty

Resection procedures

or

Partial or total wrist fusion.

Follow-Up

Follow-up is determined by:

Diagnosis

Treatment

and progression of:

Symptoms.

Prognosis

Most causes of wrist pain can be substantially improved when the underlying disorder is:

Correctly identified

and treated appropriately.

Clinical Summary

First step: Localize the pain as radial, dorsal, ulnar, volar, or diffuse.

Radial pain: Think de Quervain disease, scaphoid fracture, scapholunate injury, CMC/STT arthritis, and Wartenberg syndrome.

Dorsal pain: Common causes include extensor tenosynovitis and ganglion cyst.

Ulnar pain: Consider TFCC tear, DRUJ pathology, ECU/FCU tendinopathy, hook of hamate fracture, ulnocarpal impaction, and lunotriquetral injury.

Volar pain: Common causes are flexor tenosynovitis and carpal tunnel syndrome.

Diffuse pain: Consider osteoarthritis, inflammatory arthritis, and infection.

Imaging: Begin with PA, lateral, and oblique wrist radiographs; add scaphoid, carpal tunnel, CT, or MRI views as dictated by the suspected diagnosis.

Red flag: Severe pain with passive motion, swelling, warmth, erythema, or systemic illness should raise concern for septic arthritis and prompt urgent aspiration and treatment.

Treatment: Most diagnoses begin with activity modification, immobilization, analgesia, and diagnosis-specific therapy, while surgery is reserved for unstable, displaced, compressive, infectious, or refractory pathology.

Key Principle

Wrist pain is a symptom rather than a diagnosis, and the most useful first step is careful:

Anatomic localization.

Radial, dorsal, ulnar, volar, and generalized pain patterns each have characteristic:

Differential diagnoses and provocative findings.

A thorough examination should assess:

Tenderness, motion, tendon function, ligament stability, nerve symptoms, and joint inflammation.

Plain radiographs are the initial imaging study for most patients, while:

CT

MRI

or

Arthroscopy

may be required for selected fractures, ligament injuries, or unclear diagnoses.

Urgent recognition of:

Infection, unstable fracture, neurovascular compromise, or advanced nerve compression

is essential to prevent long-term:

Loss of wrist and hand function.

Orthopaedic Surgery - Wrist Anatomy and Exam

Basics

The wrist is a complex articulation formed by:

Eight carpal bones

arranged in:

Two rows.

These bones provide mobility while maintaining stability between the:

Forearm

and

Hand.

Carpal Bones

From radial to ulnar, the:

Proximal carpal row

contains:

Scaphoid

Lunate

Triquetrum

and

Pisiform.

Distal Carpal Row

From radial to ulnar, the:

Distal carpal row

contains:

Trapezium

Trapezoid

Capitate

and

Hamate.

Dorsal Extensor Compartments

The dorsal wrist contains:

Six extensor compartments

that transmit the extensor tendons from the forearm into the:

Hand and digits.

First Dorsal Compartment

The first and most radial compartment contains:

Abductor pollicis longus

and

Extensor pollicis brevis.

Clinical Significance of the First Compartment

These tendons form the:

Radial border of the anatomic snuffbox.

Stenosing tenosynovitis of this compartment produces:

de Quervain tenosynovitis.

de Quervain Tenosynovitis

In de Quervain disease, thickening and irritation of the first dorsal compartment restrict smooth tendon gliding and produce:

Radial-sided wrist pain

especially with:

Thumb motion

and

Ulnar deviation.

Second Dorsal Compartment

The second compartment lies radial to:

Lister tubercle

and contains:

Extensor carpi radialis longus

and

Extensor carpi radialis brevis.

Third Dorsal Compartment

The third compartment passes around the ulnar side of:

Lister tubercle

and contains:

Extensor pollicis longus.

Anatomic Snuffbox

The extensor pollicis longus forms the:

Ulnar border of the anatomic snuffbox.

The first dorsal compartment tendons form its:

Radial border.

EPL Rupture

The extensor pollicis longus may rupture in association with:

Rheumatoid arthritis

or following selected:

Distal radius fractures.

Fourth Dorsal Compartment

The fourth compartment lies just ulnar to the third and contains:

Four extensor digitorum tendons

and

Extensor indicis proprius.

Posterior Interosseous Nerve

The terminal posterior interosseous nerve lies deep to the extensor tendons in this region and contributes predominantly:

Articular sensory fibers

near the dorsal wrist.

Fifth Dorsal Compartment

The fifth compartment overlies the distal:

Radioulnar joint

and contains:

Extensor digiti minimi.

Sixth Dorsal Compartment

The sixth compartment contains:

Extensor carpi ulnaris.

It lies adjacent to the:

Ulnar head

and

Ulnar styloid.

ECU Abnormality

The ECU tendon may become:

Inflamed

Subluxated

or

Ruptured.

In rheumatoid arthritis, attritional tendon injury may occur because of:

Distal radioulnar joint disease.

Volar Wrist Compartments

Important volar passages include the:

Carpal tunnel

and

Guyon canal.

These transport major:

Tendons

Nerves

and

Vessels

into the hand.

Diagnosis

Symptoms involving the wrist may originate locally or may be:

Referred from more proximal structures.

Referred Pain

Potential sources include:

Cervical disc disease

Cervical osteoarthritis

Brachial plexus disorders

and entrapment syndromes involving the:

Elbow

or

Shoulder region.

Pregnancy Considerations

Pregnancy is associated with an increased incidence of:

Carpal tunnel syndrome

because of:

Fluid retention

and increased pressure within the:

Carpal tunnel.

Postpartum de Quervain Disease

New mothers also have an increased incidence of:

de Quervain tenosynovitis

often associated with repetitive lifting and positioning of:

Infants.

History

A complete history should include:

Age

Hand dominance

Occupation

Sports or recreational activities

and previous:

Wrist injury or surgery.

Chief Complaint

Clarify whether the major problem is:

Pain

Weakness

Numbness

Stiffness

Instability

Clicking

or

Swelling.

Mechanism of Injury

For traumatic complaints, determine:

Direction of force

Position of the wrist

and whether the mechanism involved:

Fall

Twisting

Direct impact

or

Axial loading.

Symptom Characterization

Ask about:

Onset

Duration

Frequency

Activity relationship

Exacerbating factors

Relieving factors

and whether symptoms are worse:

At night

or during the:

Day.

Occupational History

Document:

Work demands

Current work status

and any relevant:

Workers’ compensation considerations.

Physical Examination

Examine both upper extremities whenever possible because:

Side-to-side comparison

is extremely useful.

General Observation

Observe spontaneous use of the hand and wrist during:

Conversation

Undressing

and routine:

Movement.

Smooth spontaneous motion suggests different pathology from guarded, stiff, or:

Jerky movement.

Entire Upper Extremity Examination

Because symptoms may be referred, the examination should include the:

Cervical spine

Shoulder

Elbow

Forearm

Wrist

and

Hand.

Skin Examination

Inspect for:

Warmth

Dryness

Swelling

Scars

Hair loss

and other skin:

Changes.

Warmth

Marked localized warmth may suggest:

Inflammation

or

Infection.

Anhidrosis

Abnormally dry skin may reflect impaired:

Autonomic nerve function.

Bony Palpation

Systematic palpation should include:

Radial styloid

Anatomic snuffbox

Scaphoid

Trapezium

Capitate

Lunate

Ulnar styloid

Triquetrum

Pisiform

and

Hook of the hamate.

Radial Styloid

The radial styloid is located at the distal:

Radial aspect of the wrist.

Tenderness here may occur with:

Radial styloid fracture

or nearby:

First-compartment tendon disease.

Anatomic Snuffbox

The anatomic snuffbox is the depression just distal and dorsal to the:

Radial styloid.

It becomes more obvious when the patient extends the:

Thumb.

Scaphoid

The scaphoid forms the floor of the:

Anatomic snuffbox.

It is the:

Most commonly fractured carpal bone.

Snuffbox Tenderness

Tenderness in the snuffbox after trauma raises concern for:

Scaphoid fracture.

A normal initial radiograph does not completely exclude this:

Diagnosis.

Trapezium

The trapezium lies radially and articulates with the:

First metacarpal

to form the thumb:

CMC joint.

Thumb CMC Arthritis

The thumb CMC joint is a common site of:

Osteoarthritis.

CMC Grind Test

The grind test evaluates for symptomatic:

First CMC arthritis.

The examiner stabilizes the trapezium and applies:

Axial compression

through the first metacarpal while rotating or translating the:

Metacarpal base.

Positive Grind Test

Reproduction of:

Pain

or

Crepitus

supports symptomatic:

CMC degeneration.

Capitate

The capitate is the:

Largest carpal bone.

It lies immediately proximal to the base of the:

Third metacarpal.

Lunate

The lunate lies proximal to the:

Capitate

and articulates proximally with the:

Radius.

Lunate Injury

The lunate is commonly involved in:

Perilunate and lunate dislocations

and may also sustain:

Fracture or osteonecrosis.

Central Wrist Alignment

The:

Third metacarpal

Capitate

and

Lunate

normally align along the central axis of the:

Wrist.

ECRB Relationship

The:

Extensor carpi radialis brevis

inserts at the base of the:

Third metacarpal.

Ulnar Styloid

The ulnar styloid is palpable at the distal:

Ulna.

The ECU tendon passes nearby in a groove along the:

Distal ulna.

Triquetrum

The triquetrum lies distal to the:

Ulnar styloid

within the proximal:

Carpal row.

Pisiform

The pisiform is a sesamoid bone contained within the:

Flexor carpi ulnaris tendon.

Guyon Canal

The pisiform forms the:

Ulnar border

of the entrance to:

Guyon canal.

Hook of Hamate

The hook of the hamate lies distal and radial to the:

Pisiform.

It forms the:

Radial border

of Guyon canal.

Contents of Guyon Canal

Guyon canal transmits the:

Ulnar nerve

and

Ulnar artery

into the hand.

Palmar Wrist Examination

Important structures on the volar wrist include:

Palmaris longus

Carpal tunnel

Flexor carpi radialis

and the:

Radial and ulnar arteries.

Palmaris Longus

The palmaris longus tendon, when present, lies superficially near the:

Midline of the volar wrist.

It is congenitally absent in a substantial proportion of:

Individuals.

Palmaris Longus Examination

To make the tendon prominent, ask the patient to:

Oppose the thumb and small finger

while lightly flexing the:

Wrist.

Carpal Tunnel

The carpal tunnel is a:

Fibro-osseous canal

on the volar side of the wrist.

Carpal Tunnel Boundaries

Its floor and walls are formed by the:

Carpal bones

while the roof is formed by the:

Transverse carpal ligament.

Carpal Tunnel Landmarks

Proximally, important landmarks include the:

Pisiform

and

Scaphoid tubercle.

Distally, the ligament attaches near the:

Hook of hamate

and

Trapezial tubercle.

Carpal Tunnel Contents

The tunnel contains the:

Median nerve

and

Nine flexor tendons

consisting of:

Four FDS tendons

Four FDP tendons

and

Flexor pollicis longus.

Carpal Tunnel Syndrome

Compression of the median nerve within this tunnel produces:

Carpal tunnel syndrome.

Sensory Symptoms

Patients typically experience numbness or paresthesias involving the:

Thumb

Index finger

Middle finger

and

Radial half of the ring finger.

Nocturnal Symptoms

Symptoms frequently worsen:

At night.

Motor Effects

Advanced compression may produce:

Thenar weakness

and, in severe cases,

Thenar atrophy.

Tinel Sign

Percussion over the median nerve at the volar wrist may produce:

Tingling or electrical sensations

in the median nerve:

Distribution.

Phalen Test

The Phalen maneuver involves maintaining maximal:

Wrist flexion

to provoke median nerve:

Paresthesias.

Flexion-Compression Test

Adding direct pressure over the:

Carpal tunnel

during wrist flexion may reproduce symptoms more quickly.

Symptoms developing within approximately:

30–60 seconds

support:

Median neuropathy at the wrist.

Flexor Carpi Radialis

The FCR tendon travels along the:

Radial volar wrist

and inserts primarily at the base of the:

Second metacarpal.

FCR Tendinitis

FCR tendinopathy may produce pain along the:

Volar-radial wrist.

FCR Examination

Pain may be reproduced by:

Palpation of the FCR tunnel

Resisted wrist flexion

and

Resisted radial deviation.

Radial Artery

The radial artery is palpable just radial to the:

Flexor carpi radialis tendon.

Ulnar Artery

The ulnar artery can be palpated near the:

Pisiform

as it enters the:

Hand.

Vascular Dominance

The relative contribution of the radial and ulnar arteries varies between:

Individuals.

Before procedures that may compromise one vessel, collateral circulation should be assessed when:

Clinically relevant.

Range of Motion

Range of motion should be evaluated first:

Actively

and then:

Passively.

Wrist Flexion

Normal wrist flexion is approximately:

70–80°.

Wrist Extension

Normal wrist extension is approximately:

70–80°.

Radial Deviation

Normal radial deviation is approximately:

20°.

Ulnar Deviation

Normal ulnar deviation is approximately:

30°.

Supination

Normal forearm supination is approximately:

90°.

Pronation

Normal forearm pronation is approximately:

90°.

Neurologic Examination

The neurologic examination should evaluate both:

Motor function

and

Sensation.

Motor Testing

Important myotomal functions include:

Wrist extension — predominantly C6

Wrist flexion — predominantly C7

Supination — C5–C6

and

Pronation — primarily C6–C7 with contributions from lower roots depending on the muscle tested.

Peripheral Nerve Examination

Test motor and sensory function of the:

Median nerve

Ulnar nerve

and

Radial nerve.

Sensory Testing

Useful autonomous sensory regions include:

Median nerve — volar index fingertip

Ulnar nerve — small fingertip

and

Radial nerve — dorsal first web space.

Provocative Maneuvers

Special tests help localize pathology involving:

Tendons

Ligaments

and

Peripheral nerves.

Finkelstein and Eichhoff Maneuvers

These maneuvers are used to assess:

de Quervain tenosynovitis.

Eichhoff Test

The commonly performed maneuver in which the patient places the thumb inside a closed fist and the examiner ulnarly deviates the wrist is more accurately called the:

Eichhoff test.

Positive Test

Sharp pain over the:

First dorsal compartment

supports the diagnosis of:

de Quervain tenosynovitis.

Scaphoid Shift Test

The:

Scaphoid shift test

also called the:

Watson test

assesses integrity of the:

Scapholunate ligament.

Watson Test Technique

The wrist begins in:

Ulnar deviation

and slight:

Extension.

The examiner places the thumb over the:

Scaphoid tubercle

and applies dorsal pressure while moving the wrist toward:

Radial deviation.

Positive Watson Test

With scapholunate ligament insufficiency, the scaphoid may:

Sublux dorsally

producing:

Pain

or a palpable:

Clunk.

Bilateral Comparison

Because some asymptomatic individuals have a positive maneuver, the test should be compared with the:

Contralateral wrist.

Midcarpal Shift Test

The midcarpal shift test evaluates for:

Midcarpal instability.

Technique

The forearm is stabilized in:

Pronation.

A volarly directed force is applied over the:

Capitate

while axially loading the wrist and moving it toward:

Ulnar deviation.

Positive Midcarpal Shift

A painful or reproducible:

Clunk

suggests:

Midcarpal instability.

Dorsal Midcarpal Translation

Dorsal translation of the capitate relative to the:

Lunate

may also be compared with the opposite:

Wrist.

Tinel Sign Elsewhere

Tinel testing can be performed over any accessible:

Peripheral nerve.

For example, percussion over the:

Ulnar nerve at the elbow

may reproduce symptoms in the:

Ulnar nerve distribution.

Imaging

Standard Radiographs

A standard wrist series should include at least:

Posteroanterior

Lateral

and

Oblique views.

Scaphoid View

A dedicated:

Scaphoid view

with the wrist in:

Ulnar deviation

can improve visualization of:

Scaphoid fractures.

Clenched-Fist View

A:

Clenched-fist stress view

can accentuate widening of the:

Scapholunate interval.

Comparison with the opposite wrist may be helpful when evaluating suspected:

Scapholunate ligament injury.

Occult Scaphoid Fracture

Scaphoid fractures may not be visible on initial:

Radiographs.

If clinical suspicion remains high, further evaluation may include:

Repeat radiographs

or

Advanced imaging.

Repeat Radiographs

Historically, repeat radiographs were often obtained after approximately:

7–10 days.

MRI or CT may establish the diagnosis:

Earlier.

Gilula Arcs

On a normal PA wrist radiograph, three smooth arcs known as:

Gilula lines

should be preserved.

First Gilula Arc

The first arc follows the proximal convex surfaces of the:

Scaphoid

Lunate

and

Triquetrum.

Second Gilula Arc

The second follows the distal concave surfaces of the:

Scaphoid

Lunate

and

Triquetrum.

Third Gilula Arc

The third follows the proximal surfaces of the:

Capitate

and

Hamate.

Disruption of Gilula Lines

Loss of these smooth arcs suggests:

Carpal malalignment

Fracture

or

Dislocation.

CT

CT is especially useful for:

Complex fracture assessment

and

Preoperative planning.

MRI

MRI is useful for evaluating:

Ligament tears

Tendon abnormalities

Occult fractures

Avascular necrosis

and

Soft-tissue masses.

Grip Strength

Grip strength provides an objective measure of:

Hand function.

It should be compared with the:

Contralateral side.

Pinch Strength

Pinch strength may also be measured serially to assess:

Thumb and hand function.

Clinical Summary

Key anatomy: The wrist contains 8 carpal bones in two rows and 6 dorsal extensor compartments.

Important landmarks: The scaphoid forms the floor of the anatomic snuffbox, the pisiform and hook of hamate border Guyon canal, and the transverse carpal ligament forms the roof of the carpal tunnel.

Carpal tunnel contents: The median nerve plus 9 flexor tendons.

Typical ROM: Flexion and extension about 70–80°, radial deviation about 20°, ulnar deviation about 30°, and pronation/supination about 90° each.

Key provocative tests: Eichhoff/Finkelstein for de Quervain disease, Watson scaphoid shift for scapholunate instability, midcarpal shift for midcarpal instability, and Phalen, flexion-compression, and Tinel for carpal tunnel syndrome.

Scaphoid concern: Snuffbox tenderness after trauma should raise suspicion for a scaphoid fracture, even if initial radiographs are normal.

Imaging: Standard wrist radiographs include PA, lateral, and oblique views; special views and CT or MRI are added according to suspected pathology.

Radiographic alignment: The three Gilula arcs should remain smooth and continuous; disruption suggests carpal injury or instability.

Key Principle

A systematic wrist examination should proceed from:

Inspection and palpation

to

Range of motion, neurologic testing, provocative maneuvers, and imaging.

The examiner should understand the relationships among the:

Carpal bones

Extensor compartments

Carpal tunnel

Guyon canal

and

Major neurovascular structures.

Because wrist symptoms may be referred from the:

Cervical spine, shoulder, elbow, or forearm, the entire upper extremity should be examined when the diagnosis is uncertain.

Accurate localization of:

Tenderness, instability, tendon pathology, nerve symptoms, and radiographic alignment

is the foundation of diagnosing common wrist disorders.

Orthopaedic Surgery - Vertical Talus

⸻

Basics

Congenital vertical talus is a rigid congenital foot deformity caused primarily by:

Dorsolateral dislocation of the talonavicular joint.

The deformity produces:

Hindfoot equinus

Forefoot dorsiflexion

Midfoot abduction

and contracture of several:

Tendons and soft-tissue structures.

⸻

Synonyms

Congenital vertical talus is also called:

Congenital convex pes planus

or

Congenital rocker-bottom foot.

⸻

Laterality

The condition may be:

Unilateral

or

Bilateral.

⸻

Associated Disorders

Approximately half of affected patients have an associated:

Neurologic

Genetic

or

Connective-tissue disorder.

⸻

Natural History

The deformity usually develops:

In utero.

An exception may occur in some:

Neurologic disorders

where abnormal muscle balance can produce or worsen the deformity after birth.

Without treatment, the foot generally becomes increasingly:

Rigid

with age.

⸻

Epidemiology

Congenital vertical talus is:

Rare

but has a strong association with other congenital and neurologic:

Conditions.

⸻

Myelomeningocele

Approximately:

5% of children with myelomeningocele

have been reported to develop:

Vertical talus.

⸻

Other Syndromic Associations

The deformity may occur in:

Larsen syndrome

Arthrogryposis

and selected chromosomal disorders.

⸻

Chromosomal Associations

Reported associations include:

Trisomy 13

Trisomy 18

and other:

Chromosomal abnormalities.

⸻

Sex

Boys and girls are affected approximately:

Equally.

⸻

Genetics

Most idiopathic cases are:

Sporadic.

⸻

Familial Cases

Rare familial cases have demonstrated:

Autosomal dominant inheritance

with:

Incomplete penetrance.

⸻

Pathophysiology

The deformity is thought to result from an imbalance between:

Forefoot dorsiflexors

and

Hindfoot plantarflexors.

This imbalance disrupts alignment through the:

Talonavicular joint.

⸻

Ligamentous Laxity

In some children, generalized:

Ligamentous laxity

may contribute to the deformity.

⸻

Structural Changes

The talonavicular joint becomes:

Fixed in dorsal dislocation.

At the same time:

The hindfoot remains in equinus and valgus

while the:

Forefoot is dorsiflexed and abducted.

⸻

Pathological Findings

The muscles and bones are usually structurally:

Normal on histologic examination.

The major abnormality is one of:

Alignment

and

Soft-tissue contracture.

⸻

Associated Conditions

Important associated disorders include:

Arthrogryposis

Myelomeningocele

Larsen syndrome

and

Chromosomal abnormalities.

⸻

Diagnosis

Diagnosis is based on:

Clinical examination

and

Specialized radiographs.

⸻

Signs and Symptoms

Infants are usually initially:

Asymptomatic.

⸻

Symptoms After Walking Begins

If untreated, pressure abnormalities may eventually produce:

Painful plantar calluses

and

Skin irritation.

⸻

Push-Off Dysfunction

Because the foot becomes rounded and mechanically inefficient, patients may have reduced:

Push-off strength

during gait.

⸻

Reversed Arch

The normal longitudinal arch becomes:

Reversed.

The plantar surface therefore appears:

Convex

rather than concave.

⸻

Dorsal Crease

A characteristic:

Deep dorsal crease

may be visible across the:

Midfoot.

⸻

Physical Examination

Examine the entire child rather than focusing only on the:

Foot.

⸻

Screening for Associated Abnormalities

The examination should include:

Spine

Hips

Knees

and

Other extremities

for associated congenital or neurologic:

Abnormalities.

⸻

Strength Examination

Assess motor strength in both:

Lower extremities.

This is particularly important when a:

Neurologic cause

is suspected.

⸻

Standing and Gait

If the child is old enough to walk, observe:

Standing alignment

and

Gait.

⸻

Rocker-Bottom Appearance

The sole of the foot is characteristically:

Convex.

This produces the classic:

Rocker-bottom deformity.

⸻

Hindfoot Equinus

The heel is fixed in:

Equinus

because of shortening of the:

Achilles tendon.

⸻

Hindfoot Valgus

The hindfoot is positioned in:

Valgus.

⸻

Talar Head Prominence

The head of the talus becomes prominent on the:

Medial plantar aspect of the foot.

It may be readily:

Palpable.

⸻

Forefoot Position

The forefoot is:

Abducted

and

Dorsiflexed

through the:

Midtarsal region.

⸻

Increasing Visibility With Age

As subcutaneous fat decreases with age, the characteristic deformity becomes increasingly:

Obvious.

⸻

Distinguishing From Flexible Deformities

True vertical talus is rigid and must be differentiated from:

Calcaneovalgus foot

and

Flexible flatfoot.

⸻

Imaging

⸻

Plain Radiographs

Radiography is essential for confirming the:

Rigid talonavicular dislocation.

⸻

Lateral Radiograph

On the lateral view, the talus is:

Plantarflexed

and often appears nearly:

Vertical.

⸻

AP Radiograph

On the AP view, the talus is typically directed:

Medially.

⸻

Navicular Position

The navicular is displaced:

Dorsally

and lies over the:

Neck of the talus.

⸻

Ossification Limitation

The navicular usually does not ossify until approximately:

3–4 years of age.

Therefore, its position cannot be directly visualized in:

Young infants.

Instead, alignment is inferred from the:

First metatarsal axis.

⸻

Forefoot Alignment

The forefoot is displaced:

Dorsally

and

Laterally or abducted

relative to the hindfoot.

⸻

Calcaneus

The calcaneus remains in:

Equinus.

⸻

Severe Deformity

In marked cases, the talus may become almost:

Parallel to the tibia.

⸻

Stress Plantarflexion View

The most important confirmatory radiograph is the:

Forced plantarflexion lateral view.

⸻

Technique

The examiner maximally plantarflexes the:

Forefoot

while obtaining a:

Lateral radiograph.

⸻

True Vertical Talus

In true congenital vertical talus, the:

Talonavicular joint does not reduce

with plantarflexion.

⸻

Talus–First Metatarsal Relationship

Even with maximal plantarflexion, the axis of the:

First metatarsal

remains dorsal to the:

Talus.

⸻

Normal Relationship

In a flexible foot, the first metatarsal axis becomes approximately:

Collinear with the talar axis

during forced:

Plantarflexion.

⸻

Position of the Navicular

Because the navicular is not ossified in an infant, its location is inferred from its relationship to the:

First ray.

⸻

MRI

MRI is generally:

Not required to evaluate the foot deformity itself.

⸻

Neurologic Evaluation

MRI may be appropriate when there is concern for a:

Spinal abnormality

or another:

Neurogenic cause.

⸻

Pathological Anatomy

The:

Calcaneus

is in equinus and displaced relatively:

Laterally.

⸻

Talus

The talus may be:

Hypoplastic

Medially angulated

and

Plantarflexed.

⸻

Navicular

The navicular remains:

Fixed dorsally

on the talar:

Neck.

⸻

Tendon Contractures

Typical contractures include the:

Achilles tendon

and the:

Dorsiflexor tendons.

⸻

Differential Diagnosis

Important alternatives include:

Calcaneovalgus foot

Flexible flatfoot

and

Oblique talus.

⸻

Calcaneovalgus Foot

Calcaneovalgus is usually a:

Flexible positional deformity

that can often be corrected passively.

Unlike vertical talus, there is no fixed:

Talonavicular dislocation.

⸻

Flexible Flatfoot

Flexible flatfoot becomes more normally aligned when:

Non-weight-bearing

or during:

Toe standing.

⸻

Oblique Talus

Oblique talus may resemble vertical talus on routine standing radiographs.

However, the deformity:

Reduces on forced plantarflexion views.

It is therefore generally considered a form of:

Flexible flatfoot rather than true vertical talus.

⸻

Treatment

The major goals are to:

Reduce the talonavicular joint

Correct hindfoot equinus

and establish a:

Plantigrade, functional foot.

⸻

Serial Casting

Initial treatment commonly consists of:

Serial manipulation and casting.

⸻

Direction of Manipulation

The foot is gradually manipulated into:

Plantarflexion

and

Inversion.

This is essentially the opposite direction used during correction of:

Clubfoot.

⸻

Purpose of Casting

Serial casting attempts to:

Reduce the talonavicular joint

and

Stretch the contracted dorsal soft tissues.

⸻

Incomplete Reduction

Even if casting does not fully reduce the joint, it remains useful because it:

Improves flexibility

and can simplify later:

Surgery.

⸻

Timing

Treatment is most successful when started:

Early in infancy.

Definitive correction is ideally achieved before approximately:

1 year of age.

⸻

Surgical Principle

The central goal of operative treatment is:

Reduction and stabilization of the talonavicular joint.

⸻

Talonavicular Pinning

After reduction, the joint is usually maintained with:

Percutaneous pin fixation.

⸻

Modern Minimally Invasive Approach

Whereas extensive open release was historically common, many children can now be treated with:

Serial casting

followed by:

Closed or limited reduction

Percutaneous talonavicular pinning

and

Achilles tenotomy.

⸻

Achilles Tenotomy

Because hindfoot equinus is nearly always present, the:

Achilles tendon

frequently requires:

Tenotomy or lengthening.

⸻

Dorsiflexor Lengthening

If significant dorsal contracture remains, the:

Anterior tibialis

or other dorsiflexor structures may require:

Lengthening.

⸻

Open Reduction

If the talonavicular joint cannot be reduced closed, a limited:

Open reduction

may be required.

⸻

Medial Capsular Stabilization

Selected cases may require repair or stabilization of the:

Medial joint capsule

to maintain:

Alignment.

⸻

Older Children

Children presenting late may require more extensive procedures because the deformity becomes increasingly:

Rigid.

⸻

Talonavicular Fusion

In selected older children, particularly beyond approximately:

3 years of age

with severe deformity, fusion of the:

Talonavicular joint

may occasionally be considered.

⸻

Triple Arthrodesis

Older children or adolescents with rigid, severe deformity may require:

Triple arthrodesis.

⸻

Late Salvage

In adolescents and adults with neglected deformity, salvage procedures may involve:

Triple arthrodesis

and sometimes substantial:

Talar resection.

⸻

Recurrent Deformity

Recurrence may require:

Soft-tissue reconstruction

and, in more severe cases,

Subtalar fusion.

⸻

Postoperative Care

Percutaneous talonavicular pins are often removed at approximately:

6 weeks.

⸻

Bracing

After cast and pin removal, postoperative:

Bracing

may be used for several:

Months.

⸻

Follow-Up

Patients should be followed throughout:

Childhood

and into:

Adolescence.

⸻

Monitoring Goals

Follow-up should assess:

Foot growth

Alignment

Range of motion

Skin condition

and

Gait function.

⸻

Prognosis

If untreated, congenital vertical talus generally causes progressive:

Functional impairment.

⸻

Untreated Deformity

Abnormal plantar pressure may lead to:

Painful calluses

Skin breakdown

and reduced:

Push-off.

⸻

Treated Deformity

After treatment, functional outcome depends largely on:

Quality of reduction

and preservation of:

Hindfoot and midfoot motion.

⸻

Early Treatment

Early reduction generally provides the best chance of achieving a:

Plantigrade

Painless

and

Functional foot.

⸻

Complications of No Treatment

Potential consequences include:

Painful plantar calluses

Skin ulceration

Abnormal pressure distribution

and

Poor push-off strength.

⸻

Treatment Complications

Potential complications include:

Foot stiffness

Residual valgus

Residual varus

Recurrent deformity

and need for:

Additional surgery.

⸻

Patient Monitoring

Even after successful correction, periodic examination is necessary to ensure:

Normal growth

and maintenance of:

Foot alignment.

⸻

Clinical Summary

Definition: Congenital vertical talus is a rigid rocker-bottom foot deformity caused by fixed dorsolateral dislocation of the talonavicular joint.

Typical alignment: Hindfoot equinus and valgus, with a dorsiflexed and abducted forefoot.

Important association: About half of patients have an underlying neurologic, genetic, or connective-tissue disorder.

Key examination: Convex plantar surface, medial plantar prominence of the talar head, fixed equinus, dorsal midfoot crease, and rigid forefoot dorsiflexion.

Diagnostic radiograph: The forced plantarflexion lateral view; in true vertical talus, the talonavicular relationship does not reduce.

Differential: Calcaneovalgus foot, flexible flatfoot, and oblique talus, which corrects on plantarflexion stress imaging.

Initial treatment: Early serial casting into plantarflexion and inversion.

Definitive treatment: Usually talonavicular reduction and pinning with Achilles tenotomy or lengthening.

Prognosis: Best with early correction; untreated deformity leads to abnormal plantar pressure, painful calluses, poor push-off, and progressive disability.

⸻

Key Principle

Congenital vertical talus is a rigid congenital talonavicular dislocation producing a rocker-bottom foot.

The characteristic deformity combines:

Hindfoot equinus and valgus

with

Forefoot dorsiflexion and abduction.

The diagnosis is confirmed using a:

Forced plantarflexion lateral radiograph, which demonstrates failure of the talonavicular joint to reduce.

Treatment should begin early with:

Serial manipulation and casting, followed by:

Talonavicular reduction and pin fixation with correction of Achilles and other tendon contractures.

Early treatment offers the best chance of achieving a:

Plantigrade, painless, functional foot, whereas delayed or untreated disease may require:

Fusion or other salvage procedures.

Orthopaedic Surgery - Vertebral Osteomyelitis

Basics

Vertebral osteomyelitis is an infection involving the:

Vertebral body and other spinal bony elements

and may also involve the adjacent:

Intervertebral disc space.

When the disc and adjacent vertebral endplates are both involved, the process is often referred to as:

Spondylodiscitis.

General Prevention

Preventive measures include:

Prompt treatment of bloodstream infections

Appropriate postoperative wound care

and reduction of risk factors for:

HIV, hepatitis, and injection-related infections.

Postoperative Prevention

After spine surgery, prevention includes:

Sterile wound care

Appropriate dressing changes

and indicated:

Perioperative antibiotic prophylaxis.

Epidemiology

Vertebral osteomyelitis has a:

Bimodal age distribution.

A smaller peak occurs in:

Adolescents and young adults

while the largest burden occurs in adults older than approximately:

50 years.

Immunocompromised Patients

Rates are higher in people with:

HIV

Immunosuppression

or other conditions that impair:

Host defense.

Sex

Males are affected more frequently than females, historically accounting for approximately:

60–80% of cases.

Incidence

Vertebral osteomyelitis is:

Rare.

Historical estimates have been approximately:

1 case per 250,000 persons.

Proportion of Osteomyelitis

Spinal infection represents roughly:

2–8% of all osteomyelitis cases

in historical series.

Risk Factors

Important risk factors include:

HIV

Diabetes mellitus

Organ transplantation

Recent spine surgery

Intravenous drug use

Immunosuppression

and

Alcohol misuse.

Genetics

There is no recognized:

Mendelian genetic association

for typical vertebral osteomyelitis.

Pathophysiology

Most vertebral infections arise through:

Hematogenous spread.

Hematogenous Seeding

The vertebral bodies have a rich:

Arterial and venous blood supply

particularly near the:

Endplates.

This facilitates deposition of circulating:

Microorganisms.

Endplate and Disc Involvement

In adults, infection often begins near the:

Vertebral endplate

and then spreads across the disc space to the adjacent:

Vertebral body.

Postoperative Infection

After spinal instrumentation, bacteria may adhere to hardware and form:

Biofilm.

This can make infection more resistant to:

Antibiotic therapy

and host:

Immune clearance.

Etiology

The most common causative organism is:

Staphylococcus aureus.

MRSA

Methicillin-resistant:

S. aureus

is an important consideration, particularly in:

Postoperative

Healthcare-associated

and high-risk infections.

Pseudomonas

Pseudomonas aeruginosa

is more frequently associated with:

Injection drug use

and some:

Immunocompromised patients.

Gram-Negative Organisms

Organisms such as:

Klebsiella

Escherichia coli

and

Proteus

may occur following:

Genitourinary infection

or bacteremia.

Postoperative Infection

Postoperative spinal infections are commonly caused by:

S. aureus

and may involve organisms with increased:

Antibiotic resistance.

Tuberculosis

Mycobacterium tuberculosis

can cause vertebral osteomyelitis, classically called:

Pott disease.

This is less common in many developed settings but remains important in:

Endemic regions

and

Immunocompromised patients.

Associated Conditions

Potential associated complications and conditions include:

Epidural abscess

Discitis

Paravertebral abscess

Meningitis

Myelitis

Sepsis

HIV

and

Intravenous drug use.

Diagnosis

Diagnosis depends on:

Clinical suspicion

Inflammatory markers

Blood cultures

and

Imaging.

Signs and Symptoms

The most common presenting symptom is:

Back pain.

Pain Pattern

Pain is often:

Insidious

Persistent

and

Progressive.

It may occasionally begin:

Acutely.

Constitutional Symptoms

Patients may also have:

Fever

Chills

Night sweats

Anorexia

and

Weight loss.

Children

Children may present with:

Irritability

Fussiness

Refusal to walk

or nonspecific:

Back discomfort.

Neurologic Deficit

Neurologic deficits are less common but may occur with:

Epidural extension

Cord compression

or

Cauda equina involvement.

Deformity

Advanced disease can cause:

Vertebral destruction

leading to:

Kyphosis

or other:

Spinal deformity.

Postoperative Infection

Postoperative infection may present with:

Wound drainage

Purulence

Persistent pain

or

Failure of expected recovery.

Physical Examination

Common findings include:

Paraspinal tenderness

and

Muscle spasm.

Cervical Infection

Cervical infection may produce:

Torticollis

or painful limitation of:

Neck movement.

General Weakness

Systemic illness may produce:

Fatigue

and

Generalized weakness.

Meningeal Signs

When meningeal irritation is present, findings such as:

Kernig sign

may be positive.

Hamstring Spasm

Children may develop:

Hamstring spasm

or reluctance to flex the spine.

Immunocompromised Patients

Classic inflammatory findings may be:

Blunted or absent

in immunocompromised patients.

A lack of fever does not exclude:

Spinal infection.

Laboratory Tests

Complete Blood Count

The white blood cell count may be elevated, but this occurs in only about:

Half of patients

in some series.

A normal CBC does not exclude:

Vertebral osteomyelitis.

ESR

The:

Erythrocyte sedimentation rate

is highly sensitive for spinal infection.

It is elevated in approximately:

90% of patients

in historical series.

Limitation of ESR

ESR is nonspecific and may also remain elevated following:

Surgery

or in other inflammatory conditions.

CRP

C-reactive protein

is useful for:

Diagnosis

and

Monitoring treatment response.

Postoperative CRP

After uncomplicated surgery, CRP usually falls toward normal within approximately:

6–10 days.

Persistent or secondary elevation should raise concern for:

Infection.

Blood Cultures

Blood cultures should be obtained before antibiotics whenever:

Clinically feasible.

They may identify the pathogen and allow earlier:

Culture-directed therapy.

Additional Cultures

Selected patients may require:

Fungal cultures

or testing for:

Tuberculosis

depending on exposure and risk profile.

Imaging

Plain Radiographs

Early radiographs may be:

Normal.

Radiographic abnormalities usually appear:

Late.

Late Radiographic Findings

Possible findings include:

Endplate erosion

Disc-space narrowing

Vertebral body destruction

and eventually:

Collapse or fusion.

MRI

MRI is the:

Preferred imaging study.

MRI Signal

Typical findings include:

Low signal on T1-weighted images

and

High signal on T2-weighted or fluid-sensitive sequences.

Contrast Enhancement

Post-gadolinium imaging may demonstrate:

Endplate enhancement

Disc enhancement

Paravertebral inflammation

or

Abscess formation.

Epidural Disease

MRI is particularly important for evaluating:

Epidural abscess

and

Neural compression.

CT

CT may demonstrate:

Osteolysis

Cortical destruction

and

Bony collapse.

It is also useful for guiding:

Percutaneous biopsy.

Nuclear Medicine

When MRI cannot be performed, nuclear medicine imaging may be considered.

Options include:

Bone scintigraphy

and other:

Infection-sensitive studies.

Biopsy

Image-guided:

Percutaneous biopsy

is often important in adults when the organism has not been identified from:

Blood cultures.

Open Biopsy

Open biopsy may be required when:

Percutaneous biopsy is nondiagnostic

or when surgery is already indicated for:

Decompression or debridement.

Pediatric Cases

In a child with a highly characteristic clinical and imaging picture, biopsy may not always be:

Necessary.

Pathological Findings

Biopsy may demonstrate:

Inflammatory cells

and sometimes the causative:

Microorganisms.

Tuberculosis Histology

Tuberculous infection may show:

Caseating granulomas

and

Necrosis.

Differential Diagnosis

Important alternatives include:

Vertebral fracture

Tumor

Disc herniation

and other causes of:

Back pain.

Infection Versus Tumor

Spinal infection typically involves the:

Endplate and adjacent disc space.

In contrast, many tumors initially:

Spare the disc space.

This distinction is helpful but not:

Absolute.

Treatment

Management depends on:

Organism

Neurologic status

Spinal stability

and presence of:

Abscess or sepsis.

Initial Stabilization

Initial treatment typically includes:

Antibiotic therapy

and, when needed,

Spinal immobilization.

Culture Before Antibiotics

When the patient is clinically stable, obtain:

Blood cultures

and ideally:

Tissue cultures

before starting antibiotics.

Exception

Antibiotics should not be delayed in patients with:

Sepsis

Hemodynamic instability

or rapidly progressive:

Neurologic compromise.

Empiric Antibiotics

Initial therapy may require:

Broad-spectrum intravenous antibiotics

until culture and sensitivity results become available.

Culture-Directed Therapy

Once the pathogen is known, treatment should transition to:

Targeted antimicrobial therapy.

Immobilization

A brace may help control:

Pain

and protect against:

Instability.

TLSO

Thoracolumbar infection may occasionally require a:

Thoracolumbosacral orthosis

for support.

Activity

During the acute painful phase, activity may need to be:

Restricted.

Bed Rest

Short-term bed rest may be required in patients with:

Severe pain

or

Instability.

Prolonged immobility should be avoided when possible because of the risks of:

Deconditioning

and

Venous thromboembolism.

Hospitalization

Many patients initially require:

Hospital admission

for intravenous antibiotics and monitoring of:

Neurologic status

Sepsis

and

Medical comorbidities.

Physical Therapy

Rehabilitation begins once pain and spinal stability permit:

Progressive mobilization.

Postoperative Warning Sign

Unexpected worsening pain during postoperative therapy may indicate:

Deep infection

and should prompt:

Reassessment.

Medication

Empiric therapy should cover likely:

Gram-positive organisms

and, when risk factors exist,

Gram-negative organisms.

MRSA Coverage

Vancomycin

is commonly used when coverage for:

MRSA

is required.

Gram-Negative Coverage

Agents with antipseudomonal and Gram-negative activity, such as:

Piperacillin-tazobactam

may be considered in selected patients.

Definitive therapy should be based on:

Culture results

and infectious-disease guidance.

Surgery

Most uncomplicated cases can be treated:

Nonoperatively.

Surgery is reserved for specific:

Indications.

Indications for Surgery

Potential indications include:

Failure of antibiotic treatment

Need for diagnostic open biopsy

Epidural or paravertebral abscess

Sepsis

Progressive spinal deformity

Persistent severe pain

Mechanical instability

and

Neurologic deficit.

Surgical Principles

The major goals are:

Adequate debridement

Neural decompression when required

and

Restoration of spinal stability.

Instrumentation

Rigid fixation may be required when infection has produced:

Instability

or major structural:

Destruction.

Instrumentation can be used in infected fields when combined with:

Appropriate debridement and antimicrobial treatment.

Follow-Up

Antibiotic therapy is commonly continued for approximately:

6 weeks

and sometimes longer depending on:

Organism

Extent of infection

and clinical response.

Historical protocols often used:

6–8 weeks of intravenous therapy.

Modern regimens may include an earlier transition to highly bioavailable:

Oral antibiotics

in selected patients.

Infectious-Disease Follow-Up

Management is often coordinated with an:

Infectious-disease specialist.

Mobilization

As symptoms improve, patients should undergo:

Early progressive mobilization.

Prognosis

Most patients improve with:

Timely diagnosis

and

Appropriate antimicrobial therapy.

Outcome is less favorable when diagnosis is delayed or when there is:

Neurologic injury

Sepsis

or major:

Spinal destruction.

Complications

Important complications include:

Epidural or paravertebral abscess

Vertebral collapse

Autofusion

Neurologic compromise

Paralysis

and

Cauda equina syndrome.

Abscess Formation

Infection may extend into:

Paravertebral

or

Epidural spaces.

An epidural abscess can rapidly threaten:

Neural structures.

Vertebral Collapse

Progressive bone destruction may result in:

Compression deformity

and

Kyphosis.

Spontaneous Fusion

Healing may lead to:

Disc-space loss

and eventual:

Intervertebral autofusion.

Neurologic Compromise

Cord, nerve-root, or cauda equina compression can produce:

Weakness

Sensory loss

Bowel or bladder dysfunction

or

Paralysis.

Patient Monitoring

Follow-up should include:

Clinical symptoms

Neurologic examination

and

Inflammatory markers.

Serial Laboratory Monitoring

Trend:

CRP

and

ESR

to assess response to:

Treatment.

CRP generally changes more rapidly than:

ESR.

Follow-Up Imaging

Plain radiographs may be repeated every approximately:

4–8 weeks

until the spine is clinically and structurally:

Stable.

Repeat MRI

Repeat MRI is not routinely necessary if the patient is improving.

It should be considered when there is persistent or worsening:

Pain

Fever

Neurologic deficit

or concern for:

Abscess or treatment failure.

Clinical Summary

Typical presentation: Insidious, progressive back pain, sometimes with fever, night sweats, chills, or weight loss.

Most common organism: Staphylococcus aureus.

Major risk factors: Diabetes, immunosuppression, IV drug use, HIV, recent spine surgery, and bacteremia.

Key laboratory tests: ESR and CRP are usually elevated; obtain blood cultures before antibiotics when feasible.

Best imaging: MRI with contrast is the preferred study and assesses vertebral infection, disc involvement, epidural abscess, and neural compression.

Biopsy: CT-guided biopsy is important in adults when blood cultures do not identify the organism.

Treatment: Usually culture-directed antibiotics, with bracing or temporary activity restriction as needed.

Surgery: Required for neurologic deficit, instability, progressive deformity, abscess with compression, sepsis, refractory pain, or failure of medical treatment.

Major complications: Epidural abscess, vertebral collapse, deformity, paralysis, and cauda equina syndrome.

Key Principle

Vertebral osteomyelitis is usually a hematogenous infection of the vertebral body and adjacent endplates, often extending into the disc space.

The most common presentation is:

Persistent back pain, while fever may be absent, especially in:

Immunocompromised patients.

The most useful diagnostic combination is:

Inflammatory markers, blood cultures, and MRI with contrast.

Most patients can be treated with:

Prolonged culture-directed antimicrobial therapy, while surgery is reserved for:

Neurologic compromise, abscess, instability, progressive deformity, sepsis, or failure of nonoperative treatment.

Close follow-up is necessary to detect:

Persistent infection, collapse, deformity, or neurologic deterioration.

Orthopaedic Surgery - Unicameral Bone Cyst

⸻

Basics

A unicameral bone cyst is a:

Benign, fluid-filled, membrane-lined cavity within bone

that occurs primarily during:

Childhood and adolescence.

It is also known as a:

Simple bone cyst

or

Solitary bone cyst.

⸻

Natural History

These lesions generally become progressively less active with:

Skeletal maturation

and may eventually fill with:

Normal bone.

They are uncommon in:

Adults.

⸻

Location

Approximately:

80%

occur in the:

Proximal humerus

or

Proximal femur.

⸻

Less Common Sites

Other possible locations include:

Proximal tibia

Distal tibia

Distal femur

Calcaneus

Distal humerus

Radius

Fibula

Ilium

Ulna

and

Rib.

⸻

Relationship to the Physis

Unicameral bone cysts are usually:

Centrally located

and develop adjacent to the:

Growth plate

within the metaphysis.

As the child grows, the cyst may become located farther into the:

Metaphyseal-diaphyseal region.

⸻

Epiphyseal Extension

Extension across the: