Resection of Medial Talocalcaneal Coalition With Interposition of a Pediculated Flap of Tibialis Posterior Tendon Sheath.

Background: The purpose of the study was to present a novel operative technique in the management of medial talocalcaneal coalition (TC) and to report our clinical and radiologic results after interposition of a pediculated flap (PF) of the tibialis posterior tendon sheath. Methods: Twelve feet of 10 patients with a medial TC were treated with the interposition of PF of the tibialis posterior tendon sheath following resection. Pre- and postoperative clinical examinations were performed to evaluate the range of motion and the function of the tibialis posterior muscle of the affected foot. Pain was registered by visual analog scale (VAS) and the function of the foot by the American Orthopaedic Foot & Ankle Society (AOFAS) hindfoot score. The mean follow-up duration was 57.2 months (SD 37.2 range 12-128) after surgery. Magnetic resonance imaging (MRI) was carried out to assess the outcome. Results: All patients reported a significant reduction of pain (P = .002) at the final follow-up. The activity level had improved since the operation, and the subtalar joint motion was increased, but no weakness of the tibialis posterior muscle could be observed. The AOFAS hindfoot score was significantly improved (P = .002). MRI did not reveal any migration of the tibialis posterior tendon sheath, and the interposed PF was confirmed at the resection zone. Furthermore, no TC relapse or ruptures of the functional anatomical structures could be observed. Conclusion: The resection combined with the interposition of a PF of the tendon sheath seems to avoid relapse of TC and improves symptoms and the function of the foot. Level of Evidence: Level IV, case series.