Midterm Outcome of Avon Patellofemoral Arthroplasty for Posttraumatic Unicompartmental Osteoarthritis

Background: Patellofemoral arthroplasties have been successfully used in the management of isolated patellofemoral joint (PFJ) osteoarthritis (OA). We hypothesized that in posttraumatic PFJ OA, isolated unicompartmental arthroplasty should be associated with reliable pain relief, patient satisfaction, and functional outcome at midterm follow-up. Methods: Fifty-one Avon PFJ (Stryker, Mahwah, NJ) isolated unicompartmental arthroplasties (47 patients; 29 men, 18 women) were identified at a mean follow-up of 7.1 years (range, 5-11 years). The average age at surgery was 57 years (range, 37-69 years). Results: All patients reported excellent pain relief, satisfaction, and functional outcomes. Median Oxford Knee Score was 38 at latest follow-up with a significant improvement from preoperative scores (P <.0005). There were 2 revisions: 1 for pain and 1 for progression of OA. The probability for survival (Kaplan-Meyer analysis) with revision as end point was 96.1%. Conclusion: The study has shown good midterm results for Avon PFJ (Stryker, Mahwah, NJ) system in posttraumatic PFJ OA, at midterm follow-up in a relatively young patient cohort. (C) 2016 Elsevier Inc. All rights reserved.