Does a prior hip arthroscopy affect clinical outcomes in metal-on-metal hip resurfacing arthroplasty?

The effect of a prior hip arthroscopy on the outcome of a subsequent metal-on-metal hip resurfacing arthroplasty (HRA) has not been studied. Forty-three patients received an HRA after a prior hip arthroscopy (arthroscopy cohort). A 1:2 matching analysis was performed to formulate a control cohort of 86 patients. Range of motion, Harris Hip Score, University of California at Los Angeles activity score, Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) score, and Short Form-12 scores were assessed at 6 weeks, 3 months, 6 months, 1 year, and most recent follow-up visits. At 6-week follow-up, the arthroscopy cohort showed a decreased WOMAC score compared with the control cohort (72.9 [SD, 15.5] vs 80.5 [SD, 11.8], respectively; P = .05). However, no significant difference was appreciated between the 2 cohorts for any of the clinical indices measured after 6 weeks postoperatively. This study shows that a prior hip arthroscopy does not appear to affect the short-term, clinical outcomes of a metal-on-metal HRA.