Surgical Approaches: Malleolar Osteotomy

→ To access OLT, surgeons sometimes need to temporarily cut the ankle bone (malleolus) and move it aside. Like opening a hatch to reach inside. It heals after, but adds recovery time and potential complications.

When Is Osteotomy Needed?

Posteromedial lesions are often difficult to access with arthroscopy alone and may require a medial malleolar osteotomy (MMO). The 2024 DGOU recommendations note that MMO has a minor effect on clinical outcome compared to other factors [128].

2024 German Cartilage Registry Data

A large registry study examined MMO prevalence and consequences [129]:

• MMO improves visibility and accessibility of the talus
• But poses risk of periprocedural morbidity
• Osteotomy consolidation: 98.5% success rate
• Malreduction rate: 23.9% (lower with 3 screws vs 2 screws: 16.7% vs 32%)

MMO vs Anterior Malleolar Osteotomy (2025)

A 2025 comparison study found [130]:

• No significant difference in surgical complication rates between MMO and AMO
• Functional outcomes significantly better at 1 year with MMO
• No significant difference at 2-year follow-up

Hardware Removal

A 2025 study on adolescent athletes found 75% had osteotomy fixation screws removed due to hardware irritation [131]. Osseous union typically occurs at 6.2 weeks average.

Added September 17, 2026 — a measurable rule for when the malleolus can be left alone: the anterior three-quarters of the dome

→ Everything above prices the malleolar osteotomy — the deliberate cut through the ankle bone that opens the joint for cartilage work — but nothing on this page said when it can be skipped. A Bern group measured, on MRI, how far back each patient’s lesion sat on the dome of the talus, then checked who actually needed the bone cut. The rule that fell out: lesions confined to the front three-quarters of the dome could generally be reached through a soft-tissue opening at the front of the ankle, no osteotomy; past that line, the osteotomy became likely. That line is measurable on the MRI this ankle already has.

The paper is the one this site’s single open abstract watch had been waiting on since its bare DOI registration: Ivanova, Krause, and Anwander’s Bern cohort in Foot and Ankle Surgery, now PubMed-indexed with its abstract [481]. Fifty AMIC cases, lesion position measured as the distance from the anterior cartilage margin to the posterior lesion border relative to talar dome length: an anterior arthrotomy alone sufficed in 70%; the cut-off predicting osteotomy was 73.3% of dome length (AUC 0.821; sensitivity 80%, specificity 83%); posteromedial lesions needed the osteotomy most often.

Read it with its limits, which run in one direction here: the rule was derived for AMIC — a membrane that can be glued into a defect reached at an angle. The operation actually discussed for this ankle is a structural block graft, which demands perpendicular access to seat a plug and plausibly tolerates far less posterior extension; fifty patients, one center, no outcomes by approach, and the measurement convention is the authors’ own. What it contributes is the number itself: this ankle’s lesion is medial-dome with a 14 mm anteroposterior extent, its posterior border position is measurable on the September MRI today, and “where does the lesion end, as a fraction of the dome — and does that change the approach?” is now a concrete, literature-anchored question for the surgical-planning consult. The 2012 operation came through an access osteotomy; whether the revision must is, for the first time on this page, a question with a measurable input rather than a surgeon’s-preference answer.