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Orthopaedic Surgery - Ankle Arthritis

Basics

Ankle arthritis is a degenerative condition affecting the tibiotalar joint. Although osteoarthritis can involve the ankle, it occurs less frequently than osteoarthritis of major weight-bearing joints such as the hip and knee.

Unlike hip and knee osteoarthritis, which is commonly primary or age-related, ankle arthritis is most often associated with previous trauma or abnormal ankle mechanics.

Post-traumatic ankle arthritis therefore tends to occur in a younger population than primary osteoarthritis of other major joints.

Causes of Degeneration

Previous ankle injury is the most common cause of degenerative ankle arthritis.

Fractures involving the malleoli, distal tibial plafond, or talus can alter joint congruity and produce abnormal loading of the articular cartilage.

Chronic ankle instability may similarly produce repetitive abnormal motion and uneven distribution of forces, gradually leading to cartilage deterioration.

Other Causes

Other disorders that may eventually produce ankle arthritis include osteochondral lesions of the talus, osteonecrosis, chronic infection, and inflammatory arthropathies.

Patients with rheumatoid arthritis and other systemic inflammatory conditions frequently develop involvement of both the ankle and adjacent joints of the foot.

Ankle Cartilage

The articular cartilage of the ankle differs structurally from that of the hip and knee.

Ankle cartilage is relatively thin and has a more uniform extracellular matrix.

These biological and mechanical characteristics may partly explain why primary osteoarthritis of the ankle is less common despite the high loads transmitted through the joint during walking and other activities.

General Prevention

Appropriate treatment of ankle fractures is important because restoration of joint alignment and congruity may reduce the future risk of post-traumatic arthritis.

Accurate fracture reduction and correction of persistent malalignment help minimize abnormal mechanical loading of the articular surface.

Weight control is also important. Reducing excess body weight decreases repetitive loading across the ankle and may reduce symptoms or slow progression of degenerative changes.

Epidemiology

Symptomatic ankle arthritis is considerably less common than symptomatic arthritis of the hip or knee.

It has been reported to occur approximately nine times less frequently than symptomatic hip and knee arthritis.

Despite this lower incidence, ankle arthritis may cause substantial disability because of the joint’s essential role in normal gait and weight-bearing.

Risk Factors

The major risk factors include previous ankle trauma, chronic ankle instability, and inflammatory arthritis.

Recurrent ankle sprains, ligamentous insufficiency, malalignment after fracture healing, and articular surface damage can all increase the likelihood of degenerative change.

Systemic inflammatory conditions can damage the ankle through chronic synovitis and progressive cartilage destruction.

Etiology

Trauma

Post-traumatic arthritis may develop following fractures involving the ankle joint.

Common injuries include malleolar fractures, tibial plafond or pilon fractures, and talar fractures.

Even appropriately treated fractures may later lead to arthritis if the articular cartilage was damaged at the time of injury.

Ankle Instability

Chronic ligamentous instability causes abnormal translation and rotation of the talus within the ankle mortise.

Repeated episodes of instability may concentrate load on limited areas of cartilage and accelerate joint degeneration.

Untreated or recurrent instability is therefore an important mechanical cause of ankle osteoarthritis.

Inflammatory Disease

Inflammatory conditions such as rheumatoid arthritis may cause chronic synovial inflammation and progressive destruction of the articular cartilage.

Multiple joints of the foot and ankle may be involved simultaneously.

The resulting deformity and instability can further accelerate degeneration.

Osteonecrosis

Osteonecrosis, particularly involving the talus, may lead to collapse of the subchondral bone.

Loss of the normal talar contour produces joint incongruity and abnormal load transmission, which may result in secondary ankle arthritis.

Osteochondral Lesions

An osteochondral defect or osteochondritis dissecans lesion of the talus may damage both the articular cartilage and underlying subchondral bone.

Large or chronic lesions may eventually contribute to degenerative arthritis of the ankle.

Infection

Previous septic arthritis can cause substantial destruction of the joint cartilage.

Even after successful eradication of infection, residual joint incongruity, stiffness, and cartilage loss may lead to severe postinfectious arthritis.

Diagnosis

Signs and Symptoms

Pain is the most common symptom of ankle arthritis.

Patients may also report swelling, stiffness, instability, giving way, locking, or deformity.

Symptoms usually worsen during prolonged standing, walking, running, or other weight-bearing activities.

As the disease progresses, pain may also occur during routine daily activities or at rest.

History

A detailed history should identify any previous ankle injury, fracture, dislocation, recurrent sprains, or surgical treatment.

The clinician should determine how the original injury was managed and whether residual deformity or instability remained.

Medical history should also include conditions associated with inflammatory arthritis, infection, osteonecrosis, or systemic disease.

Physical Examination

The ankle should be examined both while the patient is seated and while standing.

Standing examination is important for evaluating overall alignment, deformity, and weight-bearing mechanics.

The joint should be inspected for swelling, deformity, erythema, muscle wasting, and surgical scars.

Palpation

The examiner should palpate the ankle joint for tenderness, warmth, and effusion.

Tenderness should be localized carefully to determine whether pain originates from the tibiotalar joint or from neighboring structures such as the subtalar joint.

This distinction is important because ankle and subtalar arthritis may coexist but require different treatment strategies.

Range of Motion

Ankle dorsiflexion and plantarflexion should be measured and compared with the opposite side.

Arthritis commonly causes progressive loss of motion, particularly dorsiflexion.

Restricted motion may contribute to compensatory gait patterns and increased stress on adjacent joints.

Ligament Stability

The ankle ligaments should be assessed for mechanical instability.

Anterior drawer and talar tilt testing may help identify chronic ligamentous insufficiency.

Persistent instability may be both a cause of arthritis and an important consideration when planning reconstructive surgery.

Neurologic Examination

Motor and sensory function should be examined to identify associated neurologic abnormalities.

Weakness or sensory loss may indicate peripheral neuropathy, nerve injury, radiculopathy, or another neurologic disorder that may affect treatment and rehabilitation.

Vascular Examination

The vascular status of the extremity should be assessed carefully.

The dorsalis pedis and posterior tibial pulses should be palpated, and capillary refill should be checked.

Adequate circulation is particularly important when surgical treatment is being considered because vascular compromise increases the risk of wound-healing complications.

Gait Assessment

The patient’s gait should be observed.

An antalgic gait is common because the patient reduces the amount of time spent weight-bearing on the painful ankle.

Patients with limited dorsiflexion may compensate by externally rotating the foot or circumducting the limb during swing phase.

Other compensatory gait patterns may develop depending on the degree of stiffness and deformity.

Imaging

Plain Radiographs

Initial imaging should include standard weight-bearing radiographs of the ankle.

Routine views include anteroposterior, lateral, and mortise radiographs.

Weight-bearing images are particularly useful because they demonstrate joint-space loss and alignment under physiologic loading conditions.

Radiographic Findings

Typical features of ankle arthritis include joint-space narrowing, subchondral sclerosis, subchondral cyst formation, and osteophytes.

Joint-space loss may be uniform or asymmetric depending on the underlying cause.

Post-traumatic malalignment may produce focal narrowing on one side of the joint.

Radiographs may also demonstrate previous fractures, deformity, hardware, or talar collapse.

CT

Computed tomography provides more detailed evaluation of the bony architecture.

CT may help determine the severity and distribution of arthritis and is useful for evaluating complex deformity or previous fractures.

It can also assess associated subtalar joint degeneration, which may influence the choice of surgical procedure.

MRI

MRI is not routinely required for straightforward end-stage ankle arthritis.

It may be helpful when plain radiographs suggest an osteochondral lesion, osteonecrosis, or tumor.

MRI can also evaluate surrounding tendons, ligaments, cartilage, and other soft-tissue structures when these are suspected as additional sources of pain.

Differential Diagnosis

Important differential diagnoses include osteochondritis dissecans or osteochondral lesions of the talus, osteonecrosis or avascular necrosis, posterior tibial tendinitis, and subtalar joint arthritis.

A bone or soft-tissue tumor should also be considered when imaging or clinical findings are atypical.

Accurate localization of the pain is essential because conditions involving adjacent joints and tendons may mimic ankle arthritis.

Treatment

General Measures

Initial treatment is generally nonoperative.

The aim is to reduce pain, decrease mechanical stress across the joint, maintain function, and postpone or avoid surgery when possible.

Treatment should be individualized according to symptom severity, degree of arthritis, alignment, age, activity level, and patient expectations.

Medication

Nonsteroidal anti-inflammatory drugs are commonly used to reduce pain and inflammation.

Simple analgesics may also be used as needed.

Medication provides symptomatic relief but does not reverse the underlying cartilage degeneration.

Orthotic Devices

Bracing may reduce painful ankle motion and improve stability.

An ankle-foot orthosis (AFO) can limit excessive movement, support deformity, and redistribute load across the lower extremity.

More rigid braces may be useful in patients with advanced disease or significant instability.

Footwear Modification

Appropriate footwear can substantially reduce symptoms in some patients.

A rocker-bottom sole allows the body to progress over the foot while reducing the amount of motion required through the ankle joint.

A solid ankle cushion heel or other shoe modifications may also decrease painful loading and improve gait efficiency.

Corticosteroid Injection

An intra-articular corticosteroid injection may provide temporary pain relief and reduce synovial inflammation.

Injection can also help confirm that the ankle joint itself is the primary source of pain.

The duration and degree of benefit vary among patients.

Weight Loss

Weight reduction should be encouraged in overweight patients.

Lower body weight decreases repetitive forces across the ankle during standing and walking.

Weight management may improve symptoms and reduce stress on both the diseased ankle and adjacent joints.

Duration of Nonoperative Treatment

A reasonable trial of nonsurgical treatment is generally recommended before considering major reconstructive surgery.

If symptoms remain disabling despite approximately 3–6 months of appropriate conservative treatment, surgical options may be discussed.

The timing of surgery should also take into account the patient’s age, functional demands, deformity, and radiographic severity.

Activity Modification

Patients should limit activities that produce repetitive high loads across the ankle.

Excessive walking may need to be reduced during symptomatic periods.

High-impact activities such as running, jumping, and cutting or pivoting sports should generally be avoided when they produce significant pain.

Low-Impact Exercise

Low-impact exercise should be encouraged to maintain cardiovascular fitness and muscle conditioning.

Suitable activities include stationary cycling, swimming, and aquatic exercise.

These activities reduce impact loading while allowing continued physical activity.

Assistive Devices

A cane, crutches, or other walking aids can reduce weight transmitted through the painful ankle.

A cane is usually held in the hand opposite the affected ankle.

Assistive devices are particularly useful during severe exacerbations or while awaiting definitive treatment.

Physical Therapy

Physical therapy is not always central to the initial management of isolated ankle arthritis.

However, therapy may help maintain strength, optimize gait, and address compensatory abnormalities.

Physical therapy is particularly important after surgical treatment to restore motion, strength, balance, and functional mobility.

Complementary Therapies

The effectiveness of supplements such as glucosamine for ankle arthritis remains uncertain.

Evidence from other arthritic conditions cannot necessarily be directly applied to the ankle.

Patients should understand that these products have not been clearly demonstrated to alter the progression of ankle osteoarthritis.

Surgical Management

Surgery is considered when pain and functional impairment remain substantial despite appropriate nonsurgical treatment.

The procedure selected depends on the severity and distribution of arthritis, alignment, age, activity level, bone quality, and condition of neighboring joints.

Options range from joint-preserving procedures to fusion or total ankle replacement.

Ankle Arthroscopy

Arthroscopy may be useful in selected patients with relatively early or focal disease.

The procedure allows removal of impinging osteophytes, loose bodies, and unstable chondral fragments.

Debridement can improve symptoms when mechanical impingement is a major source of pain.

Arthroscopy is generally less useful in diffuse end-stage arthritis with complete joint-space loss.

Distraction Arthroplasty

Ankle distraction arthroplasty is a joint-preserving option for selected patients with mild to moderate arthritis.

An external fixator is used to distract the joint surfaces temporarily, reducing mechanical loading across the articular cartilage.

The aim is to decrease pain and potentially improve the biological environment of the joint while preserving ankle motion.

This procedure is generally reserved for carefully selected patients.

Supramalleolar Osteotomy

A supramalleolar tibial osteotomy may be considered when ankle arthritis is associated with malalignment.

Indications may include fracture malunion, tibial deformity, or arthritis predominantly involving one part of the ankle joint.

By realigning the distal tibia, the procedure shifts load away from the damaged portion of the joint toward healthier cartilage.

This can relieve pain while preserving the ankle joint.

Ankle Arthrodesis

Ankle arthrodesis, or ankle fusion, remains an established salvage procedure for severe ankle arthritis.

Fusion eliminates painful movement at the tibiotalar joint by permanently joining the tibia and talus.

Internal fixation is commonly achieved with screws, although other fixation techniques may be used.

Indications for Fusion

Ankle fusion has broad indications and may be used for post-traumatic or degenerative arthritis, postinfectious arthritis, large osteochondral defects, rheumatoid or other inflammatory arthritis, and talar osteonecrosis.

It is particularly useful when the joint is severely destroyed, unstable, deformed, or unsuitable for replacement.

Outcomes After Fusion

Most appropriately selected patients experience substantial pain relief after successful fusion.

Although ankle range of motion is permanently lost, many patients remain satisfied because painful movement is eliminated.

Motion from the subtalar, midfoot, and forefoot joints partially compensates during walking.

However, these adjacent joints may experience increased mechanical stress over time.

Total Ankle Arthroplasty

Total ankle arthroplasty, or ankle replacement, has become increasingly accepted with improvements in implant design and surgical technique.

The damaged tibial and talar joint surfaces are replaced with prosthetic components while preserving movement at the ankle.

Modern implant designs have improved outcomes compared with earlier generations.

Advantages of Total Ankle Replacement

A major advantage compared with fusion is preservation of ankle range of motion.

Maintaining motion may allow a more physiologic gait and may reduce compensatory loading of neighboring joints.

There is also the potential for a lower risk of secondary hindfoot and midfoot arthritis caused by altered mechanics, although long-term outcomes depend on multiple factors.

Disadvantages of Total Ankle Replacement

Ankle replacement has several limitations compared with fusion.

It may be associated with a greater number of perioperative complications and requires appropriate bone quality, alignment, ligament stability, and soft-tissue condition.

Prosthetic components also have a finite lifespan.

Wear, loosening, subsidence, or mechanical failure may eventually require revision surgery.

Revision Considerations

Failure of a total ankle replacement can lead to loss of bone stock.

Substantial bone loss may make subsequent revision arthroplasty or conversion to fusion technically difficult.

For this reason, patient selection is critical, especially in younger or highly active individuals.

Follow-Up

Patients with ankle arthritis should be reviewed periodically to assess progression of symptoms and functional limitation.

Follow-up allows modification of conservative treatment and provides an opportunity to discuss surgical options if pain becomes increasingly disabling.

Changes in alignment, instability, adjacent-joint symptoms, and walking ability should also be monitored.

Prognosis

The overall prognosis is fair and depends heavily on the underlying cause and severity of the disease.

Mild or moderate symptoms may remain manageable for prolonged periods with activity modification, bracing, medication, and other conservative measures.

However, many patients with severe end-stage arthritis ultimately require surgery to achieve satisfactory pain control and restore function.

Complications of Nonoperative Treatment

Nonoperative management is generally associated with few major complications.

Potential concerns include medication-related adverse effects, temporary discomfort from braces, skin irritation, and progressive functional limitation if the arthritis continues to worsen.

The underlying degenerative process may continue despite symptomatic treatment.

Surgical Complications

Potential surgical complications include wound-healing problems, infection, malalignment, nerve injury, and vascular injury.

Following fusion, nonunion or malunion may occur, and increased mechanical stress may eventually contribute to secondary arthritis of the subtalar or midfoot joints.

Following total ankle arthroplasty, complications may include implant loosening, subsidence, wear, fracture, infection, and eventual prosthetic failure.

Adjacent-Joint Arthritis

Loss of ankle motion after fusion alters the mechanics of the hindfoot and midfoot.

Over time, this may increase stress across adjacent joints and contribute to progressive degenerative change.

This potential complication should be considered when counseling younger patients who may live for many decades after fusion.

Patient Monitoring

Patients should be followed according to their symptoms and the severity of arthritis.

Clinical monitoring should include pain, swelling, range of motion, alignment, instability, gait, neurovascular function, and activity tolerance.

Repeat radiographs may be obtained when symptoms progress or when surgical treatment is being considered.

The overall goal is to maintain function and pain control while determining the most appropriate timing and type of intervention.