title: Brake Reaction Time After Hip Arthroscopy for Femoroacetabular Impingement and Labral Tear.
abstract: OBJECTIVE
  To determine if a difference exists in brake reaction time (BRT) before and after hip arthroscopy for femoroacetabular impingement (FAI) and labral tear compared with age- and gender-matched controls.
  
  
  METHODS
  Consecutive adult subjects undergoing primary hip arthroscopy were eligible for this prospective investigation. Individuals with symptomatic FAI and labral tear that underwent hip arthroscopy with minimum 8 weeks follow-up were included. BRT was measured using the RT-2S reaction time tester a maximum of 6 weeks preoperatively and every 2 weeks postoperatively for 8 weeks. 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 postoperative BRT values were compared with Mann-Whitney and analyses of variance. Association of BRT and STST tests was performed with Spearman correlation. An a priori sample size calculation determined that minimally 18 subjects per group (surgery group vs control group) were necessary to detect, with 80% power (difference of 0.2 seconds in BRT).
  
  
  RESULTS
  Nineteen subjects (age 37.1 ± 12.7 years, 10 women, 11 right hip) were analyzed. All subjects underwent arthroscopic labral repair and FAI correction. There was no difference between preoperative (604 ± 148 milliseconds [ms]) and postoperative (608 ms 2 weeks; 566 ms 4 weeks; 559 ms 6 weeks; 595 ms 8 weeks) BRT. There was no difference between controls and subjects at any time point. There was a strong negative correlation between BRT and STST preoperatively and at 4 and 6 weeks postoperatively and a moderate negative correlation at 2 weeks postoperatively.
  
  
  CONCLUSIONS
  After hip arthroscopy for FAI and labral tear, BRT is not different from preoperative values or that of controls. In addition, BRT had a significant correlation with STST in the first 6 weeks after surgery.
  
  
  METHODS
  Level II, diagnostic, prospective.
authors.affiliation: Houston Methodist Orthopedics & Sports Medicine, Houston, Texas, U.S.A.
authors.forename: Angelina M
authors.initials: AM
authors.lastname: Vera
authors.affiliation: Houston Methodist Orthopedics & Sports Medicine, Houston, Texas, U.S.A.
authors.forename: Naseem
authors.initials: N
authors.lastname: Beauchman
authors.affiliation: Houston Methodist Orthopedics & Sports Medicine, Houston, Texas, U.S.A.
authors.forename: Patrick C
authors.initials: PC
authors.lastname: McCulloch
authors.affiliation: Houston Methodist Orthopedics & Sports Medicine, Houston, Texas, U.S.A.
authors.forename: Brayden J
authors.initials: BJ
authors.lastname: Gerrie
authors.affiliation: Houston Methodist Orthopedics & Sports Medicine, Houston, Texas, U.S.A.
authors.forename: Domenica A
authors.initials: DA
authors.lastname: Delgado
authors.affiliation: Houston Methodist Orthopedics & Sports Medicine, Houston, Texas, U.S.A.. Electronic address: joshuaharrismd@gmail.com.
authors.forename: Joshua D
authors.initials: JD
authors.lastname: Harris
mesh_terms: D000328:Adult; D001182:Arthroscopy; D001334:Automobile Driving; D016022:Case-Control Studies; D005260:Female; D057925:Femoracetabular Impingement / Q000601:surgery*; D051445:Fibrocartilage / Q000601:surgery*; D006801:Humans; D008297:Male; D011183:Postoperative Complications; D011446:Prospective Studies; D016059:Range of Motion, Articular; D011930:Reaction Time; D016896:Treatment Outcome