Orthopaedic Surgery - Ankle Pain

Basics

Ankle pain is an extremely common clinical complaint with a broad range of possible causes. It may result from traumatic injury, degenerative or inflammatory arthritis, sports-related conditions, overuse, infection, systemic disease, or neoplastic processes.

Successful treatment depends on accurately identifying the underlying pathology. A detailed knowledge of ankle anatomy, careful history-taking, and a systematic physical examination are therefore essential for developing an appropriate differential diagnosis.

Ankle Anatomy

The ankle joint is formed by the talus, distal tibia, and distal fibula.

The lateral ligament complex consists of the anterior talofibular ligament (ATFL), calcaneofibular ligament (CFL), and posterior talofibular ligament (PTFL).

The distal tibiofibular syndesmosis is supported primarily by the anterior inferior tibiofibular ligament and posterior inferior tibiofibular ligament.

Medial ankle stability is provided by the superficial and deep components of the deltoid ligament complex.

Epidemiology

Ankle pain is extremely common and may affect individuals of all ages.

Its prevalence generally increases with age because degenerative joint disease, chronic tendinopathy, and systemic inflammatory conditions become more frequent in older individuals.

Etiology

Potential causes include acute trauma, degenerative arthritis, inflammatory arthritis, stress fractures, repetitive overuse, osteochondral lesions of the talus, tendinitis, tendon tears, acute ligament sprains, and chronic ankle instability.

Infectious conditions such as septic arthritis and osteomyelitis can also produce ankle pain.

Less commonly, pain may result from a bone or soft-tissue neoplasm.

Traumatic Causes

Pain developing immediately after a traumatic episode may result from an ankle sprain, fracture, tendon strain or rupture, osteochondral injury, or dislocation.

The mechanism of injury, location of tenderness, ability to bear weight, swelling, and presence of deformity help determine the likely diagnosis.

Arthritis

Ankle arthritis may be either degenerative or inflammatory.

Degenerative arthritis commonly produces activity-related pain, progressive stiffness, swelling, and reduced range of motion.

Inflammatory arthritis may produce prolonged morning stiffness, warmth, swelling, and involvement of multiple joints.

Stress and Overuse Injuries

Repetitive loading can result in stress fractures, tendinitis, chronic tendinosis, and osteochondral lesions.

Symptoms commonly develop gradually and worsen with activity.

Pain may initially resolve with rest but can become persistent if repetitive loading continues.

Infection

Acutely severe ankle pain associated with warmth, erythema, swelling, and marked pain during passive movement should raise concern for septic arthritis.

Osteomyelitis should be considered when pain is associated with chronic wounds, previous surgery, systemic infection, or persistent unexplained symptoms.

Prompt recognition is essential because untreated infection may rapidly damage bone and articular cartilage.

Geriatric Considerations

In older individuals, common causes of ankle pain include degenerative arthritis, inflammatory arthritis, posterior tibial tendon dysfunction, chronic tendinosis, and gout.

Reduced bone quality, muscle weakness, altered balance, and age-related changes in tendons and cartilage may also contribute.

Pediatric Considerations

In children and adolescents, ankle pain frequently follows trauma.

Other important causes include an occult tarsal coalition and bone or soft-tissue tumors.

Persistent unexplained pain, particularly when accompanied by night symptoms, swelling, or a mass, requires further investigation.

Pregnancy Considerations

During pregnancy, transient ankle pain may occur because of lower-extremity edema and altered biomechanics.

Increased body weight, changes in posture, ligamentous laxity, and altered gait can increase mechanical loading around the ankle.

However, other common adult causes should still be considered when symptoms are significant or persistent.

Associated Conditions

Systemic disorders associated with ankle pain include rheumatoid arthritis, other inflammatory arthropathies, gout, and Lyme disease.

Structural disorders such as tarsal coalition may also cause chronic pain, stiffness, and recurrent ankle symptoms.

Diagnosis

Signs and Symptoms

Well-localized pain after an acute traumatic event may represent an ankle sprain, fracture, or tendon injury.

Severe pain without trauma, together with substantial swelling, warmth, erythema, and marked pain during passive range of motion, should raise suspicion for septic arthritis or an acute gout attack.

Chronic activity-related ankle pain in adults commonly suggests degenerative arthritis, whereas prolonged morning stiffness may suggest an inflammatory disorder.

Ankle pain and swelling accompanied by a skin rash following a tick bite may indicate Lyme disease.

History

A detailed history should identify the onset, duration, location, and character of the pain.

The clinician should ask about previous trauma, activities that reproduce symptoms, sporting participation, occupational demands, and previous ankle disorders.

The relationship of symptoms to activity and rest can provide important diagnostic information.

Important Historical Features

The presence of morning pain or stiffness may indicate inflammatory disease.

A history of gout, particularly previous involvement of the great toe, should be documented.

Constitutional symptoms such as fever, night sweats, unexplained weight loss, night pain, or rest pain may suggest infection, inflammatory disease, or neoplasm.

A history of tick exposure should also be obtained when clinically relevant.

Physical Examination

Physical examination should begin by identifying the exact site of pain and tenderness.

The medial and lateral malleoli, hindfoot, and proximal fifth metatarsal should be palpated, particularly after trauma.

The tendons, ligaments, and joint line should then be examined systematically.

Tendon Examination

The posterior tibial tendon, peroneal tendons, Achilles tendon, and extensor tendons should be palpated.

Pain, swelling, crepitus, weakness, or tenderness may indicate tendinitis, tendinosis, or tearing.

Resisted muscle testing can help determine whether a particular tendon is contributing to symptoms.

Ligament Examination

The medial deltoid ligament, lateral ligament complex, and distal tibiofibular syndesmotic ligaments should be examined for tenderness and instability.

Provocative testing may help identify acute or chronic ligamentous injury.

Findings should be compared with the opposite ankle whenever possible.

Joint-Line Examination

The anterior ankle joint line and capsule should be palpated for tenderness or swelling.

Joint-line pain and effusion may occur with arthritis, synovitis, osteochondral injury, or infection.

Range of Motion

Both active and passive ankle motion should be assessed and compared with the unaffected side.

Restricted motion may occur with arthritis, post-traumatic stiffness, joint effusion, tarsal coalition, or infection.

Severe pain during passive movement should increase concern for significant intra-articular pathology.

Stability and Strength

Ligamentous stability should be assessed with appropriate stress testing.

Manual muscle strength should also be evaluated.

Weakness may result from tendon injury, neurologic dysfunction, chronic instability, or inhibition caused by pain.

Skin Examination

The skin around the ankle should be assessed for bruising, erythema, wounds, scars, rash, swelling, and increased warmth.

The presence of a joint effusion should also be noted.

Skin findings may provide useful clues to traumatic, infectious, inflammatory, or systemic causes.

Neurovascular Examination

A complete neurovascular assessment of the foot and ankle should be performed.

Motor function, sensation, pulses, and capillary refill should be documented.

Neurologic abnormalities may indicate peripheral nerve injury or another neurologic condition contributing to the pain.

Gait Assessment

The patient’s gait should be observed whenever possible.

An antalgic gait may indicate pain with weight-bearing.

Other abnormalities, such as altered foot progression, inability to perform heel rise, or reduced ankle motion, may suggest tendon dysfunction, arthritis, instability, or structural deformity.

Laboratory Tests

Laboratory investigations are selected according to the suspected diagnosis rather than ordered routinely.

When septic arthritis is suspected, investigations commonly include a complete blood count with differential, erythrocyte sedimentation rate, and C-reactive protein.

Inflammatory Arthritis Investigations

Patients suspected of having rheumatoid or another inflammatory arthritis may undergo appropriate rheumatologic testing.

Investigations may include rheumatoid factor, inflammatory markers, antinuclear antibodies, and other disease-specific serologic tests.

Laboratory findings should be interpreted in conjunction with the patient’s clinical presentation.

Gout Investigations

A serum uric acid level may support the assessment of suspected gout.

However, uric acid may be normal during an acute attack, and a normal result does not exclude the diagnosis.

Joint aspiration and crystal analysis provide greater diagnostic certainty.

Lyme Disease Investigations

When the clinical presentation and exposure history suggest Lyme disease, Lyme antibody testing may be appropriate.

Testing should be guided by geographical exposure, tick history, rash, and associated systemic manifestations.

Imaging

Plain Radiographs

Initial imaging commonly consists of standing anteroposterior, lateral, and mortise radiographs of the ankle.

These views help identify fractures, alignment abnormalities, arthritis, osteophytes, joint-space narrowing, and other bony abnormalities.

Foot Radiographs

An oblique radiograph of the foot may be obtained when calcaneonavicular coalition is suspected.

Additional specialized views may be selected according to the location and suspected cause of symptoms.

MRI

MRI is valuable for detecting occult conditions that may not be visible on plain radiographs.

It may identify stress fractures, osteochondral lesions, occult fractures, tendon abnormalities, tendon tears, ligamentous injuries, bone marrow abnormalities, and neoplasms.

MRI also provides detailed information regarding cartilage and other soft-tissue structures.

CT

CT provides detailed assessment of bony anatomy.

It can define fracture fragments, articular involvement, and complex fracture patterns.

CT may also help identify tarsal coalition, bone cysts, osteoid osteoma, and other osseous lesions.

Arthrocentesis

Joint aspiration is particularly useful when septic arthritis, gout, or pseudogout is suspected.

Synovial fluid can be analyzed for cell count, Gram stain, bacterial culture, and crystals.

Septic Arthritis Findings

Synovial fluid from a septic joint may demonstrate a positive Gram stain or bacterial culture.

Staphylococcus aureus is among the most common organisms responsible for septic arthritis.

Because infection can rapidly destroy the joint surface, investigation and treatment should proceed urgently when suspicion is high.

Crystal Arthropathy

In gout, synovial fluid contains monosodium urate crystals.

Pseudogout is characterized by calcium pyrophosphate crystals.

Crystal analysis helps distinguish these conditions from septic arthritis and other inflammatory disorders.

Differential Diagnosis

The differential diagnosis includes ankle sprain, ankle fracture, tendon strain or rupture, stress fracture, tendinitis, chronic tendinosis, and degenerative osteoarthritis.

Other possibilities include rheumatoid or inflammatory arthritis, septic arthritis, Lyme disease, acute gout, and osteochondral lesions of the talar dome.

Additional Differential Diagnoses

Less common but important causes include bone tumors, soft-tissue neoplasms, and tarsal coalition.

The patient’s age, history of trauma, duration of symptoms, examination findings, and imaging results help narrow the diagnosis.

Treatment

General Measures

Treatment should be directed at the underlying cause.

Minor ankle sprains and low-grade traumatic injuries may initially be treated with rest, ice, compression, and elevation (RICE).

Weight-bearing can then be gradually increased as pain and swelling improve.

Management of Ankle Fractures

Patients with ankle fractures should be appropriately splinted.

They should generally remain non-weight-bearing until the fracture has been fully evaluated for stability.

Displaced or unstable fractures require prompt orthopedic assessment and may require surgical fixation.

Hot and Swollen Ankle

A hot, erythematous, swollen ankle requires careful evaluation.

Arthrocentesis may be necessary to distinguish septic arthritis from gout or another inflammatory process.

This distinction is particularly important because septic arthritis requires urgent treatment.

Activity

Patients with minor sprains or low-grade trauma may begin progressive weight-bearing as tolerated.

Activity should be increased according to pain, swelling, stability, and recovery of function.

Non-Weight-Bearing

Patients with unstable ankle fractures should remain non-weight-bearing while awaiting definitive orthopedic management.

Crutches, a walker, or another assistive device may be required.

Protected Weight-Bearing

Protected weight-bearing in a cast, boot, or brace can be useful for tendon strains, tendinitis, chronic tendinosis, stress fractures, osteochondral lesions of the talus, and symptomatic tarsal coalition.

The duration of protection depends on the specific diagnosis and severity.

Physical Therapy

Physical therapy is useful in many cases after the diagnosis has been established and appropriate initial treatment completed.

Rehabilitation may include range-of-motion exercises, strengthening, proprioceptive training, balance exercises, gait retraining, and gradual return to sport or work.

The treatment program should be tailored to the underlying disorder.

Medication

First-Line Therapy

Nonsteroidal anti-inflammatory drugs may be used for ankle sprains, tendon injuries, stress-related disorders, and arthritis.

Analgesic treatment should be individualized according to symptom severity and patient comorbidities.

Fracture Pain

Severe fracture pain may occasionally require stronger analgesic medication.

Medication should be used as part of a broader treatment strategy that includes immobilization and definitive management of the fracture.

Gout Treatment

Acute gout may be treated with NSAIDs, colchicine, or other anti-inflammatory medications.

Patients with recurrent attacks may require long-term urate-lowering therapy such as allopurinol after appropriate assessment.

Septic Arthritis Treatment

Septic arthritis requires prompt antibiotic treatment and drainage of the infected joint.

Drainage may be achieved by aspiration or surgical irrigation and debridement depending on the clinical circumstances.

Corticosteroid Injection

Corticosteroid injection may provide symptomatic relief for selected forms of ankle arthritis.

Infection must be excluded before any intra-articular corticosteroid injection is performed.

Surgical Management

Surgery may be required for several underlying causes of ankle pain.

Unstable fractures commonly require reduction and internal fixation.

Chronic ligament instability, significant tendon tears, or symptomatic osteochondral lesions may also eventually require operative treatment.

Surgery for Septic Arthritis

Surgical irrigation and debridement may be preferred for chronic infections, infections caused by difficult organisms, or cases that fail to respond to aspiration and antibiotics.

Operative treatment may also be favored in immunocompromised patients or when substantial purulent material is present.

Surgery for Ankle Arthritis

Severe arthritis that remains painful despite appropriate nonsurgical treatment may require ankle arthrodesis or total ankle arthroplasty.

The choice depends on patient age, activity level, alignment, bone quality, severity of degeneration, and condition of adjacent joints.

Management of Neoplasms

A suspected bone or soft-tissue tumor requires appropriate staging and biopsy before definitive treatment.

Benign lesions may require procedures such as curettage and bone grafting.

Malignant lesions may require wide surgical excision, limb-sparing reconstruction, systemic treatment, or, in selected advanced cases, amputation.

Referral

Acute fractures requiring definitive stabilization should be referred to an orthopaedic surgeon.

Chronic ankle pain that does not improve despite rest, activity modification, medication, rehabilitation, or immobilization should also prompt specialist referral.

Musculoskeletal Oncology Referral

A suspected bone or soft-tissue neoplasm should be referred to a musculoskeletal oncologist for proper staging and biopsy planning.

Biopsy should ideally be coordinated with the specialist responsible for definitive tumor treatment because poorly planned biopsy placement may complicate later surgery.

Prognosis

The prognosis depends on the underlying cause.

Minor sprains, tendon irritation, and many overuse conditions usually respond well to appropriate treatment.

More serious disorders, including advanced arthritis, infection, unstable fractures, and neoplasms, may require prolonged treatment and can produce significant long-term disability.

Complications

Many causes of ankle pain can lead to progressive pain, stiffness, weakness, instability, and loss of range of motion.

Untreated traumatic or degenerative disease may progress to chronic arthritis.

Infection can cause rapid destruction of cartilage and bone, while tumors may progressively damage surrounding structures.

Patient Monitoring

Careful short-term follow-up is important to monitor pain, swelling, gait, and recovery of ankle motion.

Range of motion should be maintained whenever clinically safe to reduce the risk of stiffness and contracture.

Patients should be reassessed promptly if there is increasing pain, swelling, fever, inability to bear weight, progressive deformity, neurologic symptoms, or other concerning clinical changes.