title: Sex differences in lumbopelvic movement patterns during hip medial rotation in people with chronic low back pain.
abstract: OBJECTIVE
  To examine sex differences in lumbopelvic motion and symptom behavior during hip medial rotation in people with low back pain (LBP). We hypothesized that men would demonstrate greater and earlier lumbopelvic motion and would be more likely to report increased symptoms compared with women.
  
  
  METHODS
  Cross-sectional observational study.
  
  
  METHODS
  University musculoskeletal analysis laboratory.
  
  
  METHODS
  Persons with chronic LBP (N=59; 30 men, 29 women) were recruited from the community and a university-based physical therapy clinic.
  
  
  METHODS
  Not applicable.
  
  
  METHODS
  Lumbopelvic rotation range of motion, amount of hip rotation completed before the start of lumbopelvic motion, and provocation of LBP symptoms during the test of prone hip medial rotation were measured.
  
  
  RESULTS
  Men demonstrated significantly more lumbopelvic rotation (men, 10.0°±5.1°; women, 4.5°±3.9°; P<.001) and completed less hip rotation before the start of lumbopelvic motion (men, 5.4°±3.8°; women, 16.0°±13.2°; P<.001) compared with women. Additionally, a significantly greater percentage of men (60.0%) than women (34.5%; P=.050) reported increased symptoms with hip medial rotation.
  
  
  CONCLUSIONS
  Men could be at greater risk than women for experiencing LBP symptoms related to hip medial rotation as a result of greater and earlier lumbopelvic motion.
authors.affiliation: Program in Physical Therapy, Washington University School of Medicine, St. Louis, MO, USA.
authors.forename: Shannon L
authors.initials: SL
authors.lastname: Hoffman
authors.forename: Molly B
authors.initials: MB
authors.lastname: Johnson
authors.forename: Dequan
authors.initials: D
authors.lastname: Zou
authors.forename: Linda R
authors.initials: LR
authors.lastname: Van Dillen
mesh_terms: D000328:Adult; D002908:Chronic Disease; D003430:Cross-Sectional Studies; D005260:Female; D006621:Hip Joint / Q000502:physiology; D006801:Humans; D017116:Low Back Pain / Q000503:physiopathology* / Q000534:rehabilitation; D008161:Lumbosacral Region / Q000503:physiopathology; D008297:Male; D008875:Middle Aged; D009068:Movement / Q000502:physiology*; D010388:Pelvis / Q000503:physiopathology; D016059:Range of Motion, Articular / Q000502:physiology*; D012399:Rotation; D012737:Sex Factors