Outcomes After Hallux Interphalangeal Joint Arthrodesis

Background: Hallux interphalangeal joint arthrodesis (HIPJA) is indicated for a variety of pathologies. Despite high nonunion rates, techniques remain unchanged. The aim of this study is to examine nonunion and complication rates and describe risk factors for treatment failure. Methods: A query of an institutional database was performed to identify all patients undergoing HIPJA procedure over a 10-year period. Records were reviewed to the procedure, evaluate patient factors, indications, and radiographic/clinical arthrodesis. Radiographic union was defined as 2 cortical continuations or bridging at the arthrodesis site, absence of hardware failure, and the absence of lytic gapping of the arthrodesis. Clinical fibrous union was defined as radiographic nonunion with painless toe range of motion and physical examination consistent with fusion across the interphalangeal joint. Results: Two hundred twenty-seven primary HIPJA procedures were identified. Our cohort demonstrated a 25.5% nonunion rate (58/227) and 21.1% reoperation rate (48/227). Patients with diabetes were at higher risk for nonunion ( P = .014), but no significant differences were identified based on smoking status or diagnosis of inflammatory arthritis. No difference was seen between implant groups: single screw, multiple screws, screw plus other fixation, nonscrew fixation. Patients with prior hallux metatarsophalangeal joint arthrodesis did not have a significantly higher nonunion rate than patients without prior first metatarsophalangeal joint arthrodesis. Patients diagnosed with radiographic nonunion were at higher risk for reoperation ( P < .0001). Conclusion: Our cohort represents the largest single-center series of HIPJA procedures published to date. We found relatively high nonunion and reoperation rates with standard current techniques. Level of Evidence: Level III, retrospective case series.