Staged Bilateral Hip Arthroscopy Compared to a Matched Unilateral Hip Arthroscopy Cohort: Minimum 2 year follow up

Abstract Purpose To determine the mHHS and NAHS at 2 year follow up in patients that underwent staged bilateral hip arthroscopy versus age, sex, and Body Mass Index (BMI) matched patients that underwent unilateral hip arthroscopy. Methods Patients that underwent staged bilateral primary hip arthroscopy between January 2007 to December 2017 for the indication of Femoroacetabular Impingement (FAI) with a minimum 2 year follow-up were identified. The control group was comprised of patients that underwent a unilateral hip arthroscopy for FAI. The modified Harris Hip Score (mHHS) and the Non-Arthritic Hip Score (NAHS) were analyzed. Results Forty-two patients (84 hips) in the bilateral group were matched with 84 patients (84 hips) in the unilateral group. Both groups had significantly improved mHHS and NAHS when comparing preoperative scores to postoperative scores (bilateral group mHHS: 45.5 ± 15.1 to 81.7 ± 17.6, p Conclusions Bilateral hip arthroscopy for the indication of FAI has improved mHHS and NAHS at 2 years of follow up compared to baseline. There was no difference in 2 year mHHS and NAHS in patients that underwent bilateral hip arthroscopy and unilateral hip arthroscopy. Patients in the bilateral hip arthroscopy group that had the contralateral surgery longer than 17 months from index procedure had lower 2 year follow up mHHS and NAHS scores than those that underwent the second surgery within 17 months of the index procedure.