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Advanced ankle surgery in operating theatre

AOAT

AOAT (Ankle Osteoplasty with Augmented Transplantation) is the ankle counterpart to the KOAT technique. It is designed for focal cartilage and subchondral bone defects of the talar dome or tibial plafond, where both the cartilage layer and the underlying bone need attention. By reshaping the bone first and then augmenting the surface with cartilage, AOAT creates a stable, congruent ankle surface that supports load and motion. Offered at London Cartilage Clinic for selected patients where standard cartilage repair alone would not address the underlying bone problem.

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Prof Paul LeeReviewed byProf Paul LeeLast reviewed 1 May 2026
Interior view of joint during arthroscopic assessment

Why bone shape matters for ankle cartilage survival

The talar dome and tibial plafond carry the entire body weight on a small surface area. If the bone beneath the cartilage is irregular, depressed, or collapsed, a cartilage graft placed on top will not match the surrounding contour and may fail under load.

  • Osteoplasty reshapes the talar or tibial bone to restore joint geometry.
  • Cartilage augmentation is then applied to the prepared, congruent surface.
  • The combined approach addresses the root cause rather than patching over the underlying problem.

AOAT is often considered after a previous ankle cartilage procedure has failed because the bone contour was not corrected at the time of the original surgery.

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The procedure and what to expect

AOAT is performed as a single-stage operation. The bone is reshaped first, then cartilage tissue is transplanted or augmented onto the prepared surface to create a smooth, load-bearing ankle joint surface.

  • Protected weight-bearing for six to ten weeks post-operatively.
  • Early physiotherapy to maintain ankle range and prevent stiffness.
  • Return to activity guided by imaging and clinical assessment of graft incorporation.

AOAT is a specialist procedure offered to a selected group of ankle patients. Your surgeon will determine whether this combined approach is appropriate based on imaging, defect characteristics, and prior surgical history.

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Professor Lee discussing surgical options

You may have more options than you think

Most patients have more treatment options than they have been told

At London Cartilage Clinic we follow a structured clinical framework across four areas of treatment. Before recommending a single procedure, we assess which combination of approaches gives you the best outcome.

Preserve

Protect what you have. Slow degeneration and manage symptoms.

Repair

Fix specific damage. Torn tissue, unstable joints, structural problems.

Regenerate

Rebuild lost tissue. Biological treatments that stimulate new growth.

Replace

When other options are exhausted. Joint replacement as a last resort.

Explore the full range of treatments available for your joint. Each hub page shows every option we offer, organised by clinical approach.

Explore Ankle Options
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Frequently Asked Questions

What does AOAT stand for?

AOAT refers to Ankle Osteoplasty with Augmented Transplantation. It is the ankle equivalent of the KOAT technique used in the knee, combining bone reshaping with cartilage augmentation in a single operation.

When is AOAT considered for the ankle?

AOAT is considered for focal cartilage and subchondral bone defects of the talar dome or tibial plafond, including osteochondral lesions of the talus, where the underlying bone contour is irregular or has collapsed and a simple cartilage graft would not sit on a stable foundation.

How does AOAT differ from a standard ankle cartilage procedure?

Standard cartilage procedures focus only on the cartilage layer. AOAT addresses the bone underneath first, reshaping it to restore normal contour, and then applies a cartilage augmentation onto that prepared surface. The combined approach is suited to defects where the bone problem caused or contributed to the cartilage failure.

What is the recovery after AOAT in the ankle?

Protected weight-bearing for six to ten weeks while the bone remodels and the cartilage integrates, with early range-of-motion exercises supervised by physiotherapy. Return to low-impact activity is gradual from three to four months, with sport-level loading from six to nine months depending on defect size and progress.

Still have more specific concerns?

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