Poster 117: Dancers Following Primary Hip Arthroscopy Demonstrate Favorable Outcomes and High Rate of Return to Dance at a Minimum 5-Year Follow-Up

OBJECTIVES: The purpose is to report minimum 5-year follow-up patient-reported outcome measurement scores (PROMS) and return to dance in dancers who underwent primary hip arthroscopy, and to identify predictors for secondary surgeries METHODS: Prospectively collected data from May 2010 and June 2016 was retrospectively reviewed. Patients were included if they participated in dance one year prior to surgery at any level, had preoperative and minimum 5-year follow-up scores for the modified Harris Hip Score (mHHS), Nonarthritic Hip Score (NAHS), Hip Outcome Score–Sports Specific Subscale (HOS-SSS), and Visual Analog Scale for pain (VAS). Exclusion criteria were previous hip conditions, previous ipsilateral hip surgery, Tönnis grade > 1, or lateral center-edge angle < 18°. The minimal clinically important difference (MCID), patient acceptable symptomatic state (PASS), and the maximum outcome improvement (MOI) were reported. A logistic regression model was used to identify predictors of secondary surgeries. RESULTS: Fifty-one hips (48 female dancers) were included. The average age and follow-up were 29.8 ± 17.2 years and 79.1 ± 23.2 months, respectively. Improvement in all PROMS (P < 0.001) was reported. Achievement rates of MCID for the mHHS, NAHS and VAS were 83.3%, 85.7% and 85.7%, respectively. Achievement rates of PASS for the mHHS and the International Hip Outcome Tool–12 were 90.5% and 81%, respectively. The MOI was 73.8% for the mHHS, and 78.6% for the NAHS. Six dancers (14.3%) underwent revision hip arthroscopy and three dancers (5.8%) converted to total hip arthroplasty. The rate to return to dance was 79.1%. Femoral head Outerbridge grade was identified as a predictor for secondary surgeries [P = 0.045, odds ratio 6.752, 95% CI [1.043 – 43.688]). CONCLUSIONS: Dancers following primary hip arthroscopy experienced significant improvement in all PROMS and achieved high rates of the MCID, PASS, and MOI at a minimum 5-year follow-up. Further, 89.3% continued to dance with 68% returning to the pre-injury or higher performance level. Femoral head Outerbridge grade was found to be a predictor for secondary surgeries.