Long-Term Results for Treatment of Chronic Ankle Instability With Fibular Periosteum Ligamentoplasty and Extensor Retinaculum Flap.

Long-term results of anatomic reconstruction for chronic ankle instability are good, but no study has shown the results of fibular periosteum ligamentoplasty associated with extensor retinaculum flap at long-term follow-up. To demonstrate the efficacy of fibular periosteum ligamentoplasty and extensor retinaculum flap in chronic lateral instability, 40 patients underwent surgery for ankle instability. Thirty-three (82.5%) patients were reviewed, with a median follow-up duration of 8.2 (range 4 to 13) years. Functional results were assessed using the Karlsson score. Static and dynamic x-ray images were realized to measure varus tilt and anterior drawer, and osteoarthritis was evaluated with the van Dijk classification. The median Karlsson score was 95 (range 80 to 100). The mean decrease in varus laxity was 11° (range 0 to 18) and in anterior drawer was 1 (range -8 to 4) mm. At the last follow-up visit, 3 (7.5%) patients showed an evidence of osteoarthritis according to the preoperative criteria of the van Dijk classification (grade 2) and 6 (15%) patients had radiologic changes, without narrowing of the joint space (grade 1). Studies that have a follow-up time >5 years are rare. This study shows that despite the excellent control of ankle laxity, severe radiographic changes (grade 2) continue to evolve in the long term. This study indicates a good long-term outcome but suggests the need to monitor the occurrence of osteoarthritis over the long term.