Orthopaedic Care Toowoomba | Summit Orthopaedics
New Patient Form

Ankle Osteoarthritis and Ankle Fusion

Overview

Ankle osteoarthritis commonly follows a previous fracture, repeated instability or another injury. Treatment depends on pain, stiffness, alignment, activity needs and health rather than X-rays alone. Ankle fusion removes painful movement by joining the tibia and talus permanently. It can reduce pain for selected people with advanced arthritis, but it sacrifices ankle motion, requires bone healing and can increase load on neighbouring joints.

Symptoms and causes

  • Pain with walking, particularly on slopes, uneven ground or after prolonged activity.
  • Stiffness, swelling and reduced ability to move the ankle up and down.
  • Grinding, catching, deformity or a feeling that the ankle is unstable.
  • Difficulty with stairs, ladders, work boots, sport or longer walking distances.
  • A history of fracture, dislocation, chronic instability, inflammatory disease, infection or osteonecrosis.

Assessment

Assessment reviews the location of pain, previous injuries and surgery, walking pattern, deformity, ankle and heel movement, circulation, nerves and the condition of nearby joints. Weight-bearing X-rays show joint-space loss, alignment and bone loss.

CT may help define the amount and shape of available bone, deformity or a previous fusion. MRI is used selectively for cartilage, tendon, or cartilage-and-bone problems. A guided injection may provide temporary relief and help confirm that the ankle joint is the main pain source.

Non-surgical treatment

  • Activity modification and lower-impact exercise while maintaining strength and general fitness.
  • A brace, ankle-foot brace (orthosis) or supportive boot to reduce painful movement.
  • Rocker-soled or stiff footwear and, where appropriate, an insole (orthosis).
  • Weight management where relevant.
  • Pain-relieving or anti-inflammatory medicine after review of medical risks.
  • An image-guided corticosteroid (cortisone) injection may provide short-term relief in selected people and may help confirm that the ankle joint is an important pain source. It does not restore cartilage. Hyaluronic acid and platelet-rich plasma have not shown consistent established benefit for ankle osteoarthritis.

Surgical options

Limited arthroscopy may help selected people with focal impingement, loose bodies or a localised injury to cartilage and underlying bone when arthritis is not advanced. A corrective bone cut (osteotomy) may help selected malalignment when useful cartilage remains. Neither procedure restores cartilage in a severely worn joint.

For advanced disease, the main definitive operations are ankle fusion and total ankle replacement. Replacement preserves some movement but has specific requirements and may need revision in the future. Fusion may be preferred for substantial deformity, high physical demands, poor bone or ligament conditions, previous infection or other factors. Suitability and referral options are considered individually.

What does ankle fusion involve?

Damaged cartilage is removed from the tibia and talus, deformity is corrected and the bones are fixed together with screws and/or a plate until they unite. The procedure may be performed arthroscopically through small incisions or open, depending on deformity, bone loss, previous surgery and access required.

Bone graft may be used to support healing. Associated hardware removal, hindfoot procedures or correction of alignment may be required in complex cases.

Life after fusion

The ankle joint no longer moves, but the heel, midfoot and forefoot continue to provide some motion. Many people adapt with suitable footwear and can walk comfortably on level ground, although uneven ground, hills, running and activities requiring deep ankle bend may remain limited. Pain relief is not guaranteed if another joint, tendon or nerve also contributes to symptoms.

Fusion changes load in adjacent joints and can contribute to arthritis over time. It is intended to exchange painful ankle movement for a stable, less painful limb—not to create a normal ankle.

Recovery

A period of non-weight-bearing or protected weight-bearing in a splint, cast or Moonboot is usually required until fusion is progressing. X-rays, and occasionally CT, guide advancement. Swelling can persist for many months.

Rehabilitation focuses on safe walking, strength, balance and adaptation of footwear. Return to driving and work depends on the side, confirmed bone healing, walking aids, medication and physical demands.

Risks and limitations

  • Delayed or failed bone healing; nicotine use is a major modifiable risk.
  • Infection, wound problems, blood clots or medical complications.
  • Nerve injury, numbness, painful hardware or scar sensitivity.
  • Malalignment, fracture or persistent pain despite union.
  • Adjacent-joint overload and later arthritis.
  • Need for bone grafting, hardware removal or revision fusion.

Frequently asked questions

Many people can walk on level ground and perform a wide range of daily activities, but the ankle no longer bends and uneven ground or high-impact activity may be more difficult.

Neither is best for everyone. Replacement preserves movement but has implant and revision considerations; fusion is durable but sacrifices motion. Anatomy, health and goals guide selection.

No. Arthroscopy may treat a focal problem in selected earlier disease but does not restore a severely worn joint.

Nicotine impairs blood flow and bone healing and significantly increases the risk that the fusion will not heal and that wound problems will occur.

Yes, but revision is more complex and may require hardware removal, renewed preparation, deformity correction and bone graft.

General information

This page provides general information only. It cannot diagnose your condition or replace advice from a clinician who has assessed you. Your treatment and recovery plan may differ from the examples described here. Follow the instructions from your treating team. In an emergency, call 000 or attend the nearest emergency department.

View Foot and Ankle treatments