Mid-term Patient-reported Outcomes of Hip Arthroplasty After Previous Hip Arthroscopy: A Matched Case-control Study With a Minimum 5-year Follow-up.

BACKGROUND Previous hip arthroscopy may affect the outcomes of subsequent hip arthroplasty. The purpose is to compare mid-term patient-reported outcomes (PROs) and complication rates in patients who had previous ipsilateral hip arthroscopy (PA) with those without a previous surgery. METHODS A minimum 5-year PROs, complications, and revision surgery rates were compared between total hip arthroplasty (THA) recipients who received PA and those without. Available intraoperative findings, procedures, and conversion time of arthroscopies were reported. The relative risk (RR) of complications and revision THAs were reported. A Kaplan-Meier analysis assessed survivorship of revision THA. RESULTS There were 34 cases (33 patients) of PA that were matched to 89 control cases (87 patients). Both cohorts reported similar scores for Harris hip score, Forgotten Joint Score, pain, and patient satisfaction. No differences in the outcomes were found based on the arthroplasty approach. A higher postoperative complication rate {RR, 2.617 (95% confidence interval [CI], 0.808 to 8.476)} and revision THA rate (RR, 13.088 [95% CI, 1.59 to 107.99]) were found in the PA group. CONCLUSION Patients with PA demonstrated similar levels of PROs as those without previous ipsilateral hip arthroscopy. There may, however, be a higher rate of complications and revision surgery in the PA group. LEVEL OF EVIDENCE III.