Interpositional Arthroplasty for Hallux Rigidus: A Systematic Review

Category: Midfoot/Forefoot Introduction/Purpose: Hallux rigidus is a common degenerative joint condition of the foot. In advanced stages of the disease, extensive procedures have been utilized including Keller arthroplasty, interpositional arthroplasty (IPA), arthrodesis, total joint replacement or synthetic cartilage replacement. IPA is a surgical procedure that attempts to maintain joint motion through insertion of a biologic spacer into the joint. However, there is still a paucity of overall clinical data regarding outcomes and complication rates following IPA procedure for the treatment of hallux rigidus.The purpose of the current study was to systematically review the outcomes of IPA in the treatment of hallux rigidus. Methods: A systematic search of the MEDLINE, EMBASE and Cochrane Library databases was performed in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines. Outcomes collected and analysed included: AOFAS score, VAS score, SF36 score, range of motion, radiographic parameters, and postoperative complications. The level and quality of evidence were recorded and assessed. Results: Sixteen studies with a total of 433 patients met inclusion/exclusion criteria. The mean AOFAS improved from 56.8±7.3 (range, 43.2-64.3) preoperatively to 84.0±6.7 (range, 71.6-90.0) postoperatively. The preoperative weighted mean total ROM was 37.7±16.2 degrees and the postoperative weighted mean total ROM was 60.3±13.4 degrees. Five studies examined joint space narrowing on plain radiographs. The mean preoperative joint space was 1.2±0.2 mm (range, 1 -1.5) and the mean postoperative joint space was 2.5±0.5 mm (range, 1.9-3). The complication rate was 18.2% with metatarsalgia as the most commonly reported complication. One study was Level III and 15 studies were Level IV. Conclusion: This systematic review demonstrates improvement in functional and ROM outcomes following IPA. The procedure however has a high complication rate. There is a low level and quality of evidence in the current literature with inconsistent reporting of data. Therefore, further well designed studies must be carried out to determine the efficacy of IPA in the treatment of hallux rigidus.