Orthopaedic Surgery - Rheumatoid Arthritis

Basics

Rheumatoid arthritis (RA) is a:

Chronic systemic autoimmune inflammatory disease

that primarily affects:

Synovial joints

but may also involve multiple extra-articular organ systems.

Potential extra-articular sites include the:

Skin

Eyes

Cardiovascular system

Lungs and pleura

Spleen

Peripheral nervous system

Pathophysiology

RA is characterized by persistent inflammation of:

Synovial tissue.

Activated immune cells, cytokines, and proliferating synovium lead to formation of inflammatory:

Pannus

which progressively damages:

Articular cartilage

Subchondral bone

Capsules

Ligaments

and

Tendons.

The ultimate consequences can include:

Joint destruction

Instability

Deformity

and

Loss of function.

Epidemiology

RA affects approximately:

0.5–1% of many adult populations, although prevalence varies geographically and ethnically.

Age

Disease onset may occur at almost any adult age but commonly begins between approximately:

35 and 50 years.

Sex

Women are affected approximately:

2–3 times more frequently than men.

Risk Factors

Important risk factors include:

Genetic susceptibility

and environmental exposures.

A well-established genetic association exists with:

HLA-DRB1 alleles, historically described as an association with HLA-DR4.

Population Differences

RA prevalence varies among populations, with historically high rates reported in some:

Indigenous North American populations.

These differences likely reflect a combination of:

Genetic

and

Environmental factors.

Genetics

Family and twin studies demonstrate a significant:

Genetic predisposition.

However, RA is:

Multifactorial

rather than a simple Mendelian disorder.

Genetic susceptibility interacts with environmental and immunologic factors to produce disease.

Etiology

The exact initiating cause is:

Unknown.

RA is considered a systemic autoimmune disorder in which abnormal:

T-cell

B-cell

and cytokine-mediated responses

target synovial and other tissues.

Development probably reflects an interaction between:

Genetic predisposition

and

Environmental triggers.

Associated Conditions

One important association is:

Felty syndrome.

Felty Syndrome

Felty syndrome classically consists of:

Long-standing rheumatoid arthritis

Splenomegaly

and

Neutropenia.

Patients may also develop:

Anemia

and, less commonly,

Thrombocytopenia.

Neutropenia increases susceptibility to:

Serious infection.

Diagnosis

Diagnosis requires integration of:

Clinical history

Physical examination

Serologic studies

and, when appropriate,

Imaging.

No single laboratory test independently establishes the diagnosis.

Pattern of Joint Disease

RA classically produces:

Bilateral

and

Symmetric inflammatory polyarthritis.

Signs and Symptoms

Early symptoms commonly include:

Joint swelling

Pain

and

Prolonged morning stiffness.

Morning stiffness frequently lasts:

30–60 minutes or longer.

Prodromal Symptoms

Before definite synovitis becomes apparent, some patients experience a prodrome consisting of:

Fatigue

Loss of appetite

Generalized weakness

Malaise

Diffuse musculoskeletal discomfort.

Historically, such constitutional symptoms have been described in a substantial proportion of patients.

Joint Pain

Pain and tenderness are concentrated around involved joints and are often aggravated by:

Movement

and sustained loading.

Typical Joint Distribution

The classic early pattern involves the:

Wrists

Metacarpophalangeal joints

and

Proximal interphalangeal joints.

The:

Distal interphalangeal joints

are usually relatively spared compared with osteoarthritis and psoriatic arthritis.

Wrist Involvement

Synovitis of the wrist is:

Extremely common

and may eventually contribute to:

Carpal instability

Tendon dysfunction

and

Hand deformity.

Foot Involvement

RA may initially present with isolated symptoms involving the:

Forefoot

or

Hindfoot.

Early manifestations may include:

Metatarsalgia

MTP synovitis

or nonspecific painful swelling.

Extra-Articular Manifestations

Systemic manifestations may include:

Rheumatoid nodules

Rheumatoid vasculitis

Pleuropulmonary disease

Peripheral neuropathy

Pericarditis

Osteoporosis

and increased:

Cardiovascular morbidity.

Rheumatoid Nodules

Rheumatoid nodules most commonly occur over:

Pressure points

and

Extensor surfaces.

They are more frequent in patients with:

Seropositive disease.

Hand Deformity

Advanced synovitis can progressively destroy:

Capsules

Ligaments

and

Tendons

resulting in characteristic rheumatoid hand deformities.

Ulnar Drift

Chronic MCP synovitis may lead to:

Ulnar deviation or ulnar drift of the fingers

with associated:

Volar subluxation of the proximal phalanges.

Tendon Dysfunction

Digital deformities may result from:

Tendon displacement

Tendon attenuation

or

Tendon rupture.

Potential late deformities include:

Swan-neck deformity

Boutonnière deformity

and loss of normal finger balance.

History

The onset is often:

Insidious.

Patients may describe gradual development of:

Joint aches

Stiffness

Swelling

and systemic symptoms over:

Weeks or months.

Physical Examination

The clinical presentation can be subtle, particularly early in disease.

A systematic musculoskeletal examination is important.

Synovitis

Inflamed joints may demonstrate:

Boggy synovial thickening

Effusion

Warmth

Tenderness

and

Restricted movement.

Hand Findings

Important findings include:

MCP swelling

Ulnar drift

MCP subluxation

PIP deformity

Reduced grip strength.

Range of Motion

Affected joints may have:

Painful

and

Restricted range of motion.

Advanced disease may cause:

Fixed contractures

or severe instability.

Laboratory Tests

No single test is completely specific for RA.

Rheumatoid Factor

Rheumatoid factor is present in a substantial proportion of patients, historically around:

Two-thirds or more.

However, it may also be positive in other diseases and in some healthy individuals.

Anti-CCP Antibodies

Antibodies against:

Cyclic citrullinated peptides

are more specific for RA than rheumatoid factor and are useful in:

Diagnosis

and

Prognostic assessment.

Anemia

A:

Normocytic, normochromic anemia

may occur as part of chronic inflammatory disease.

Inflammatory Markers

The:

ESR

and

CRP

are frequently elevated during active disease.

These can help monitor:

Disease activity

and

Response to treatment, although they are not specific to RA.

Synovial Fluid

Aspiration typically demonstrates:

Inflammatory synovial fluid

with increased leukocytes.

This confirms an inflammatory process but does not by itself distinguish RA from:

Other inflammatory arthritides

or

Infection.

Additional Serologic Testing

Additional tests may be obtained when another systemic rheumatologic disease is suspected.

These can include:

ANA

Anti-double-stranded DNA antibodies

Anti-Smith antibodies

and other disease-specific studies.

Testing should be guided by:

Clinical suspicion

rather than performed indiscriminately.

Infection Screening

Before many immunosuppressive or biologic therapies, patients may require screening for infections such as:

Hepatitis B

Hepatitis C

and

Tuberculosis.

Imaging

Plain Radiographs

Radiographs may be normal early in the disease.

As RA progresses, characteristic changes can include:

Juxta-articular osteopenia

Uniform joint-space narrowing

Marginal erosions

Subluxation

Dislocation

Hand and Wrist Radiographs

Advanced disease may demonstrate:

MCP subluxation

PIP subluxation

Carpal collapse

and erosive changes.

Ultrasound

Musculoskeletal ultrasound can identify:

Synovial hypertrophy

Effusion

Power Doppler activity

and

Early erosions

before they become obvious on standard radiographs.

MRI

MRI may demonstrate:

Synovitis

Bone marrow edema

Cartilage damage

and

Early erosive disease.

Pathological Findings

The fundamental pathological process is:

Chronic proliferative synovitis.

Inflammatory synovium forms pannus that invades:

Cartilage

and

Bone

resulting in progressive structural destruction.

Differential Diagnosis

Important alternatives include:

Osteoarthritis

Systemic lupus erythematosus

Psoriatic arthritis

Spondyloarthritis

Polymyalgia rheumatica

Infectious arthritis

Acute rheumatic fever

Ochronosis

and other inflammatory arthropathies.

Juvenile Disease

Inflammatory arthritis beginning in childhood is classified separately, most commonly under:

Juvenile idiopathic arthritis

rather than adult RA.

Osteoarthritis

Osteoarthritis generally produces:

Mechanical pain

Shorter morning stiffness

and prominent involvement of:

DIP joints

Thumb CMC joints

and weight-bearing joints.

It lacks the typical systemic inflammatory pattern of RA.

Psoriatic Arthritis

Psoriatic arthritis may produce:

Dactylitis

DIP involvement

Nail abnormalities

and asymmetric or axial disease.

Infectious Arthritis

An acutely inflamed single joint should always prompt consideration of:

Septic arthritis.

Joint aspiration is necessary when infection cannot be confidently excluded.

Treatment

General Principles

Modern RA treatment aims to:

Suppress inflammation

Prevent structural joint damage

Preserve function

and achieve:

Remission or low disease activity.

Early treatment substantially improves long-term outcomes.

Multidisciplinary Care

Management often involves:

Primary care

Rheumatology

Physical and occupational therapy

and, when structural damage becomes significant,

Orthopaedic surgery.

Rheumatology Referral

Early rheumatology involvement is important because treatment with:

Disease-modifying antirheumatic drugs

should generally begin promptly after diagnosis.

Activity

Patients should remain:

As physically active as symptoms permit.

Prolonged inactivity contributes to:

Muscle weakness

Joint stiffness

Loss of cardiovascular fitness.

Physical Therapy

Physical therapy helps maintain:

Joint range of motion

Muscle strength

Endurance

and

Mobility.

It does not independently stop the underlying autoimmune disease.

Occupational Therapy

Occupational therapy can assist with:

Joint protection

Splinting

Adaptive equipment

Hand function

and modification of:

Daily activities.

Complementary Therapies

Some complementary interventions may improve:

Pain

or

Well-being

in selected patients, but they should not replace:

Disease-modifying therapy.

Evidence varies substantially among different approaches.

Medication

The goals of drug treatment are to:

Control inflammation

Prevent joint destruction

Preserve function

Reduce pain.

Many therapies require:

Laboratory monitoring

and assessment for infection or organ toxicity.

Disease-Modifying Antirheumatic Drugs

A:

DMARD

should generally form the foundation of treatment.

Methotrexate

Methotrexate is commonly the preferred initial:

Conventional synthetic DMARD

for patients with active RA unless contraindicated.

It can reduce:

Symptoms

Inflammation

and

Radiographic progression.

Other Conventional DMARDs

Alternatives or combination agents include:

Sulfasalazine

Hydroxychloroquine

Leflunomide.

Older agents such as:

Gold compounds

and

D-penicillamine

are now rarely used.

NSAIDs

NSAIDs can reduce:

Pain

and

Stiffness

but do not prevent:

Progressive joint destruction.

They are therefore adjunctive rather than definitive disease-modifying therapy.

Glucocorticoids

Corticosteroids may provide rapid suppression of:

Inflammation.

They may be administered:

Systemically

or

Intra-articularly.

Because of significant long-term adverse effects, systemic steroids are generally used at the:

Lowest effective dose for the shortest practical duration.

Biologic DMARDs

Biologic medications include:

TNF inhibitors

and agents targeting other inflammatory pathways.

They are generally used when disease remains active despite appropriate conventional DMARD treatment or according to individualized disease severity.

Targeted Synthetic DMARDs

Modern options also include:

JAK inhibitors

in selected patients.

These agents require careful consideration of:

Infection risk

Thrombotic risk

Cardiovascular risk

and other adverse effects.

Immunosuppressive Agents

Older immunosuppressive medications such as:

Azathioprine

and

Cyclophosphamide

have limited routine roles in standard articular RA today but may be considered in selected severe systemic manifestations.

Infection Risk

Biologic and targeted immunomodulatory therapies can increase the risk of:

Serious infection.

Patients should be screened and monitored appropriately.

Cervical Spine Involvement

The cervical spine is an important orthopaedic consideration in RA.

Potential abnormalities include:

Atlantoaxial instability

Subaxial subluxation

and

Cranial settling or basilar invagination.

Mechanism of Cervical Instability

Chronic inflammatory pannus can produce:

Bone erosion

and

Ligament attenuation

around the cervical spine.

This may result in dangerous:

Instability

and potential:

Spinal cord compression.

Preoperative Cervical Spine Assessment

Any patient with longstanding or severe RA undergoing surgery should be assessed for symptoms or signs of:

Cervical instability.

This is particularly important before:

General anesthesia

and airway manipulation.

Additional cervical imaging may be required according to:

Symptoms

Examination

and operative risk.

Surgery

Orthopaedic surgery is considered when structural disease causes:

Persistent pain

Loss of function

Instability

Deformity

or

Tendon dysfunction.

Synovectomy

Synovectomy may be useful in selected patients with:

Persistent severe synovitis

when substantial cartilage destruction has not yet occurred.

Its role has decreased with more effective modern medical therapy.

Tenosynovectomy

Persistent tendon sheath inflammation can lead to:

Tendon attrition

and

Rupture.

Selected patients may benefit from:

Tenosynovectomy

before irreversible tendon failure occurs.

Tendon Rupture

Rheumatoid hand and wrist disease can cause rupture of:

Extensor

or

Flexor tendons.

Treatment may involve:

Tendon transfer

Tendon grafting

or

Direct reconstruction.

Arthroplasty

Severely destroyed joints may be treated with:

Joint replacement.

Total arthroplasty is particularly effective for advanced disease involving the:

Hip

and

Knee.

Hand Surgery

Rheumatoid hand reconstruction may involve combinations of:

Soft-tissue balancing

Tendon repair or transfer

MCP arthroplasty

Joint fusion

Realignment procedures.

Foot and Ankle Surgery

Painful deformity may require:

Forefoot reconstruction

Arthroplasty

or

Arthrodesis.

Selected fusions can improve:

Pain

Alignment

and

Walking ability.

Follow-Up

RA requires:

Long-term monitoring.

Follow-up frequency depends on:

Disease activity

Medication regimen

Comorbidities

and

Extent of joint damage.

Multidisciplinary Referral

Management may involve:

Rheumatology

Orthopaedics

Physical therapy

Occupational therapy

and other specialties depending on:

Extra-articular involvement.

Prognosis

RA remains a:

Chronic disease without a definitive cure.

However, modern early disease-modifying treatment has substantially improved:

Symptom control

Function

and

Prevention of deformity.

Disease Course

The course can be:

Fluctuating

with periods of:

Remission

and

Exacerbation.

This makes individual long-term prediction difficult.

Disability

Historically, before modern treat-to-target therapy, substantial disability and deformity were common within:

10–12 years of diagnosis.

Modern DMARD and biologic treatment has improved these outcomes considerably.

Life Expectancy

Historically, RA was associated with reduced life expectancy, in part because of:

Cardiovascular disease

Infection

and systemic inflammation.

Aggressive disease control and modern preventive care have improved prognosis.

Complications

Potential complications include:

Progressive joint destruction

Joint deformity

Tendon rupture

Cervical instability

Osteoporosis

Neuropathy

Vasculitis

Pulmonary disease

Cardiovascular disease

Treatment-Related Complications

Medication-related problems may include:

Serious infection

Hepatotoxicity

Bone marrow suppression

Renal dysfunction

Gastrointestinal toxicity

and other drug-specific adverse effects.

Patient Monitoring

Monitoring is individualized according to the:

Medication

Disease activity

Comorbid conditions.

Laboratory Monitoring

Depending on therapy, monitoring may include:

CBC

Liver function tests

Renal function

Inflammatory markers

and screening for:

Latent or active infection.

Musculoskeletal Monitoring

Patients should be assessed for progression of:

Synovitis

Joint deformity

Tendon dysfunction

Cervical symptoms

Functional decline.

Key Principle

Rheumatoid arthritis is a chronic systemic autoimmune synovitis that can progressively destroy cartilage, bone, ligaments, and tendons while also affecting multiple extra-articular organs.

The typical musculoskeletal presentation is:

Symmetric inflammatory polyarthritis involving the wrists, MCP joints, and PIP joints, with prolonged morning stiffness and boggy synovitis.

Modern management emphasizes:

Early rheumatology involvement, prompt DMARD therapy—commonly methotrexate—and escalation according to disease activity.

Orthopaedic treatment is reserved for complications such as:

Severe joint destruction, deformity, tendon rupture, instability, or painful loss of function, with particular attention to potentially dangerous:

Cervical spine instability.