Orthopaedic Surgery - Puncture Wounds of the Foot

Basics

Puncture wounds of the foot are penetrating injuries that most commonly involve the:

Plantar forefoot

or

Heel.

The penetrating object is often a:

Nail

Needle

Pin

but other materials may include:

Thorns

Glass

Wood splinters

or any sharp object capable of penetrating the plantar soft tissues.

Classification

Puncture wounds may be considered according to the timing of presentation.

Early Presentation

An early presentation occurs:

On or shortly after the day of injury.

At this stage, the major concerns are:

Wound contamination

Retained foreign body

Depth of penetration

Involvement of bone, tendon, or joint

Late Presentation

A late presentation generally occurs:

Several days after injury, often at least 3–5 days later.

At this stage, symptoms may reflect a developing:

Deep soft-tissue infection

Abscess

Septic arthritis

Tenosynovitis

or

Osteomyelitis.

Prevention

Preventive measures include:

Avoiding barefoot walking in areas containing nails, wood fragments, glass, or construction debris

and using appropriate:

Protective footwear.

Epidemiology

Puncture wounds are particularly common in:

Children and active adults.

Historical reports suggest a greater frequency in:

Males.

Incidence

Puncture wounds of the foot have historically accounted for approximately:

0.5–1% of pediatric emergency-department visits.

Most heal without deep infection.

Historical series reported deep infection in approximately:

0.6% of affected children.

Risk Factors

Important risk factors include:

Walking barefoot

Construction work

Outdoor activity

Exposure to contaminated debris

Penetration through footwear

Etiology

The penetrating object may inoculate organisms from:

Skin

Soil

Sock material

Shoe lining or sole

into deeper tissues.

Microbiology

The organisms involved depend on:

Depth

Environment

Footwear

Host factors

and

Anatomic structures penetrated.

Superficial soft-tissue infections are commonly caused by:

Staphylococcus species

and

Streptococcus species.

Pseudomonas

Pseudomonas aeruginosa is particularly associated with certain plantar puncture wounds, especially those occurring:

Through footwear, classically through the sole of an athletic shoe.

It is an important pathogen in:

Post-puncture osteomyelitis.

Polymicrobial Infection

Some puncture-related infections may be:

Polymicrobial, particularly in highly contaminated wounds or immunocompromised patients.

Deep Infection

When infection spreads deeply, it may involve structures lined by synovial tissue, including:

Tendon sheath

Joint

Bursa

and eventually

Bone.

Diagnosis

Diagnosis is based on:

Mechanism

Timing

Physical examination

and selective use of:

Laboratory tests and imaging.

Signs and Symptoms

Acute Phase

Early symptoms may include:

Pain

Swelling

Bleeding

Localized tenderness

Late Presentation

Delayed infection may produce:

Erythema

Increasing pain

Tenderness

Cellulitis

Fluctuance

Purulent or serous drainage

Altered Gait

Patients may:

Limp

Refuse to bear weight

or

Walk on the heel

to avoid loading a painful forefoot puncture site.

History

Important questions include:

When did the injury occur?

What object caused it?

Where did the puncture occur?

Was the patient barefoot or wearing a shoe?

Did the object penetrate through a sock or shoe sole?

How contaminated was the environment?

Could part of the object remain in the foot?

Early Physical Examination

Inspect the puncture site carefully for:

Depth

Wound size

Contamination

Foreign material

Associated laceration

Retained Foreign Body

Palpate for:

Focal deep tenderness

or a palpable foreign body.

Persistent focal pain after a puncture should raise suspicion for:

Retained glass, wood, thorn, or other material.

Joint Involvement

Consider whether the tract passes near a:

Metatarsophalangeal joint

Interphalangeal joint

Midfoot joint

Evaluate adjacent joint motion.

Pain with passive motion may suggest:

Septic arthritis

or another deep process.

Footwear Examination

If available, inspect the shoe for:

Location of penetration

Depth of damage

Possible retained material

This can help reconstruct the wound tract.

Late Physical Examination

Assess for local and systemic infection.

Look for:

Erythema

Swelling

Warmth

Cellulitis

Fluctuance

Drainage

Lymphatic Examination

Regional lymph nodes may become enlarged, including:

Popliteal

and

Inguinal lymph nodes.

Deep Swelling

Circumferential or dorsal swelling following a plantar puncture wound should raise concern for:

Deep infection.

Laboratory Tests

Early Presentation

Laboratory studies are usually:

Not necessary

for a fresh uncomplicated puncture wound.

Late Presentation

When infection is suspected, useful tests may include:

CBC with differential

ESR

CRP

These tests are supportive but:

Not specific.

Aspiration

If infection appears to involve a:

Joint

Bursa

or

Tendon sheath

aspiration may be performed.

Fluid should be sent for:

Gram stain

Cell count

Culture and susceptibility testing

Imaging

Plain Radiographs

Radiographs may be obtained to evaluate for:

Fracture

Bone involvement

Radiopaque foreign body

Soft-tissue gas

Late Radiographic Findings

In delayed presentations, radiographs may also show features suggesting:

Osteomyelitis

although early bone infection can still have normal radiographs.

Foreign Bodies

Plain radiographs are particularly useful for:

Metal

Glass

and other radiopaque materials.

They are less sensitive for:

Wood

Thorns

and some plastics.

Ultrasound

Ultrasound can help identify:

Soft-tissue abscess

and

Radiolucent retained foreign bodies, particularly wood.

It can also assist with:

Image-guided removal or aspiration.

MRI

MRI is useful when there is concern for:

Deep abscess

Osteomyelitis

Septic arthritis

Tendon sheath infection

It may also identify some retained foreign bodies and define the extent of deep soft-tissue involvement.

Diagnostic Wound Exploration

Local exploration may be appropriate to:

Assess wound depth

Remove contamination

Identify retained foreign material

Aggressive blind probing should be avoided because it can:

Damage deeper structures

or enlarge contamination.

Differential Diagnosis

Important complications or alternative diagnoses include:

Cellulitis

Soft-tissue abscess

Septic bursitis

Tenosynovitis

Septic arthritis

Osteomyelitis

Retained foreign body reaction

Treatment

General Principles

Management depends on:

Timing of presentation

Contamination

Depth

Presence of a retained foreign body

Evidence of infection

Patient comorbidities

Acute Presentation

Fresh wounds should undergo:

Careful cleansing

Irrigation

and, when necessary,

Limited debridement.

Any clearly visible foreign material should be removed.

Tetanus Prophylaxis

Tetanus prophylaxis should be updated according to:

Wound type

and

The patient’s immunization history.

This may include:

Tetanus-containing vaccine booster

and, in selected incompletely immunized patients with high-risk wounds,

Tetanus immune globulin.

Antibiotic Prophylaxis

Routine prophylactic antibiotics are:

Not required for every uncomplicated acute puncture wound.

They may be considered when there is:

Gross contamination

Delayed presentation

Deep penetration

High-risk host factors

or concern that follow-up will be unreliable.

Follow-Up Instructions

Patients and caregivers should be advised to return promptly for:

Increasing pain

Redness

Swelling

Drainage

Fever

Difficulty bearing weight

Late Presentation

Delayed wounds with established deep infection require more aggressive treatment.

Management may include:

Surgical irrigation and debridement

Deep tissue cultures

Targeted antibiotic therapy

Cellulitis

Cellulitis without abscess may initially be treated with antibiotics directed primarily against:

Staphylococcal

and

Streptococcal organisms.

The patient should be reassessed closely.

Failure to Improve

Failure to improve should prompt evaluation for:

Abscess

Retained foreign body

Deep-space infection

Pseudomonas infection

Osteomyelitis

Abscess

Any area of:

Fluctuance

should generally be treated with:

Incision and drainage.

Cultures should be obtained when clinically appropriate.

Pseudomonas Coverage

Empiric antipseudomonal therapy is not necessary for every puncture wound.

It should be considered particularly when:

Deep infection follows penetration through footwear

Pseudomonas is isolated from culture

or

Clinical features strongly suggest this organism.

Antibiotic selection should account for:

Patient age

Allergies

Local resistance patterns

and infection severity.

Weight Bearing

Weight bearing can be resumed gradually as:

Pain and tenderness resolve.

Deep infections or surgically treated wounds may require temporary:

Protected weight bearing.

Medication

Acute Injury

Analgesics may be used for:

Pain control.

Antibiotic use is individualized rather than automatic.

Established Infection

Antibiotics should initially cover the most likely organisms and then be changed according to:

Culture results.

Surgery

Surgical treatment is indicated for:

Deep abscess

Septic arthritis

Osteomyelitis requiring debridement

Retained foreign body not removable safely at bedside

Failure of medical treatment

Localization

Before surgery, the infection or foreign body should be localized using:

Physical examination

Radiographs

Ultrasound

or

MRI, depending on the suspected pathology.

Surgical Approach

The surgical approach should:

Reach the abnormality directly

and, when useful, follow the:

Original puncture tract.

Plantar Incisions

Plantar incisions may be used when necessary.

Whenever possible, they should avoid major:

Weight-bearing pressure points

such as the:

Central heel

or

Metatarsal heads.

Debridement

Surgical treatment should include:

Removal of devitalized tissue

Removal of foreign material

Drainage of purulence

Copious irrigation

Cultures

Deep cultures should be obtained before or during antibiotic treatment when feasible.

Special cultures for organisms such as:

Mycobacteria

or fungi may be considered when the history or chronic course suggests atypical infection.

Follow-Up

Patients should be reassessed if symptoms:

Persist

Worsen

or recur.

Follow-up may be provided by:

Primary care

Emergency medicine

Orthopaedics

Podiatry

or

Infectious disease specialists, depending on severity.

Prognosis

The prognosis is generally:

Good.

Most uncomplicated puncture wounds heal without major sequelae.

Deep Infection Risk

Historical pediatric series reported subsequent osteomyelitis in approximately:

0.6–1.8% of puncture wounds.

Complications

Potential complications include:

Cellulitis

Abscess

Retained foreign body

Septic arthritis

Tenosynovitis

Osteomyelitis

Osteomyelitis

Bone infection is uncommon but important.

It should be suspected when there is:

Persistent deep pain

Failure to improve

Recurrent drainage

Difficulty bearing weight

or persistent inflammatory findings after a puncture wound.

Septic Arthritis

A puncture tract entering or passing close to a joint may result in:

Septic arthritis.

This requires prompt:

Joint drainage

and

Antibiotic therapy.

Overall Complication Rate

One historical study reported an overall complication rate of approximately:

3.2%.

Patient Monitoring

Monitoring should focus on:

Pain

Swelling

Erythema

Drainage

Weight-bearing ability

Range of motion of nearby joints

Evidence of deep infection

Patients should continue follow-up until:

The wound has healed

and

Normal function has returned.

Key Principle

A plantar puncture wound is usually a minor injury, but a penetrating object can inoculate bacteria and leave behind a retained foreign body, resulting in delayed deep infection.

The most important early priorities are:

Thorough examination, wound cleansing, assessment for a retained foreign body, and appropriate tetanus prophylaxis.

Persistent or delayed symptoms should raise concern for:

Abscess, septic arthritis, or osteomyelitis, with Pseudomonas being particularly important in deep infections following puncture through footwear.