Radiographic Outcomes of Proximal vs Distal Syndesmotic Low Tibial Osteotomy

Abstract

Category: Ankle Arthritis; Ankle Introduction/Purpose: We aimed to determine whether the location of tibial osteotomy affects the outcome during low tibial osteotomy (LTO) with fibular osteotomy for varus ankle arthritis by comparing proximal syndesmotic (PS) and distal syndesmotic (DS) tibial osteotomy. Methods: We retrospectively reviewed the radiographic findings of 50 cases (among 47 patients) who underwent LTO with fibular osteotomy for varus ankle arthritis. The enrolled patients were divided into two groups according to the location of the tibial osteotomy: the PS group (25 cases, 24 patients) and the DS group (25 cases, 23 patients). Radiographic parameters were compared between the two groups. Results: There were no significant differences in tibial anterior and lateral surface angles, tibiomedial malleolar angle, talar center migration, and intermalleolar distance correction between the two groups (all, P>.05). However, the decreases in talar tilt (TT) and talocrural angle (TCA) were more pronounced in the DS group than in the PS group (both P<.05). Among patients with TT >=8 degrees, a greater decrease in TT (+1.0 degrees vs. -2.8 degrees) and TCA was observed in the DS group, while the PS group demonstrated greater increases in TCA and intermalleolar distance (all, P<.01). Conclusion: In this series, DS tibial osteotomy combined with fibular osteotomy was a more effective operative option than PS tibial osteotomy to correct both extra- and intra-articular deformity for varus ankle arthritis.