Ankle distraction arthroplasty is a joint-preserving technique for ankle arthritis using an external fixator to gradually separate the joint surfaces, allowing cartilage regeneration. It is an alternative to ankle fusion or replacement in younger patients.
Arthroscopic debridement of the ankle is performed first — bone spurs, loose bodies, and damaged cartilage are removed. An external fixator (Ilizarov frame or hinged fixator) is then applied with pins in the tibia and foot, distracting (separating) the ankle joint surfaces by approximately 5 mm. The fixator is worn for approximately three months, during which the patient is encouraged to weight-bear. The distraction unloads the cartilage, allowing regeneration.
Ankle distraction is considered for younger patients (under 45–55) with significant ankle arthritis who are too young for ankle replacement and wish to avoid fusion. It may delay the need for definitive surgery by several years.
Ankle brace, rocker-bottom shoes, corticosteroid injection, physiotherapy, and activity modification. Ankle fusion and ankle replacement are definitive surgical options.
Standing ankle X-rays and MRI. CT to assess bone quality. Patient must understand the commitment to wearing an external fixator for three months.
Reduction in ankle pain and potential cartilage regeneration. Studies report approximately 70% of patients maintain improvement at seven to ten years, delaying or avoiding fusion or replacement.
Very common with external fixators. Managed with pin care and antibiotics.
The frame is bulky and uncomfortable for three months.
Not all patients achieve adequate relief.
Around pins or in the joint.
Pins may loosen in bone, requiring replacement.
Through pin sites.
Superficial peroneal or sural nerve damage from pin placement.
Arthritis may progress despite distraction.
General or spinal anaesthesia for the initial procedure and frame application.
Weight-bearing in the external fixator immediately. Regular pin site care. Frame worn for approximately three months. After frame removal, progressive ankle exercises and rehabilitation. The full benefit may take six to twelve months to become apparent.
Regular pin site checks every two to four weeks during fixator use. X-rays at frame removal and at three months, six months, and one year.
Distraction preserves the native joint and may regenerate cartilage, delaying or avoiding definitive surgery. It is particularly valuable for younger patients who would outlive an ankle replacement and who wish to delay the permanence of fusion.
Yes, the external fixator is bulky and affects daily activities. However, most patients manage well with support and find the three-month commitment worthwhile for the potential benefit.