ePoster #1401 - ISHA Annual Scientific Meeting 2016

Brake Reaction Time Following Hip Arthroscopy

Joshua David Harris, MD, Houston, TX UNITED STATES
Angelina M Vera, MD, Houston, TX UNITED STATES
Naseem Beauchman, MD, Houston, TX UNITED STATES
Brayden J. Gerrie, BS, Houston, TX UNITED STATES
Domenica Delgado, BS, Houston, TX UNITED STATES
Patrick C. McCulloch, MD, Houston, TX UNITED STATES

Houston Methodist Orthopedics & Sports Medicine, Houston, TX, UNITED STATES

FDA Status Not Applicable

Summary: As early as two weeks and as late as eight weeks following hip arthroscopy, brake reaction time is not significantly different from that of pre-operative values or of age- and gender-matched control subjects with mental processing, muscle activation, and device processing times all playing significant roles

PURPOSE: To determine if a difference exists in brake reaction time (BRT) before and after hip arthroscopy in comparison to age- and gender-matched controls. METHODS: Adult subjects undergoing primary hip arthroscopy were eligible for this prospective cohort investigation. Non-arthritic and non-dysplastic individuals with symptomatic femoroacetabular impingement (FAI) and labral tear that had failed non-surgical treatments and underwent hip arthroscopy with a minimum of eight weeks follow-up were included. BRT was measured using an Advance Therapy RT2S BRT tester at a maximum of six weeks pre-operatively and every two weeks post operatively for eight weeks. The sit-to-stand test (STST) was measured at each BRT testing session. An age- and gender-matched control group without hip or lower extremity symptoms were selected and completed both BRT and STST. Continuous pre- and post-operative BRT values were compared with Mann-Whitney and ANOVA tests. Association of BRT and STST tests was performed with Spearman correlation. An a priori sample size calculation determined that a minimum of 18 subjects per group were necessary to detect, with 80% power, a difference of 0.2 seconds in BRT. RESULTS: Nineteen subjects (age 37.1 ± 12.7 years) (10 females) (11 right) were analyzed. All subjects underwent arthroscopic labral repair and FAI correction. There was no difference between pre-operative (604 ±148 milliseconds) and post-operative (608ms 2 weeks; 566ms 4 weeks; 559ms 6 weeks; 595ms 8 weeks) BRT. There was no difference in BRT between controls and subjects at any time point. There was a correlation between BRT and STST pre-operatively and at four and six weeks post-operatively. CONCLUSIONS: Following hip arthroscopy, BRT is not different from pre-operative values or that of controls. Several factors, including mental processing time, pain medication usage, brake pedal force application, hip brace use, among others, must be considered in determining safe return to driving following hip arthroscopy. LEVEL OF EVIDENCE: II, diagnostic prospective cohort