Clinical Outcomes of Revision Hip Arthroscopy for Synovial Chondromatosis

Abstract

Background: Synovial chondromatosis (SC) is a relatively rare disease and there were few studies on causes and clinical outcomes of revision surgery for SC. The purpose of this study was to evaluate clinical outcomes of revision hip arthroscopy for synovial chondromatosis.Methods: We evaluated consecutive patients who underwent revision hip arthroscopy for SC in our hospital between January 2008 and January 2020. Radiographic evaluation was made before and after surgery. Preoperative patient-reported outcomes (PROs) and PROs at final follow-up were obtained, including visual analog scale (VAS) for pain, the International Hip Outcome Tool-12 (iHOT-12) and modified Harris Hip Score (mHHS).Results: A total of 8 patients (mean age, 39.5 years; age range, 27-62 years; 5 males and 3 females) were included in this study. The recurrence rate of hip SC in our hospital was 6.8%. The average follow-up period after surgery was 47.3 months (range, 12–120 months). Before surgery, mean mHHS was 60.6±17.3 (range, 20-77), mean iHOT-12 was 43.8±13.7 (range, 18-69), and mean VAS was 3.1±1.7 (range, 1-7). At the final post-operative follow-up, mean mHHS was 83.8±16.6 (range, 43-91), iHOT-12 was 80.6±19.7 (range, 32-90), and mean VAS was 0.6±1.8 (range, 0-5). All results demonstrated statistically significant improvement (P < 0.05). Recurrence of SC was found in 2 patients 1 year and 4 years after revision hip arthroscopy, respectively.Conclusion: Hip arthroscopy had good clinical outcomes for revision surgery of SC.