title: Screening the lumbopelvic muscles for a relationship to injury of the quadriceps, hamstrings, and adductor muscles among elite Australian Football League players.
abstract: METHODS
  Longitudinal observational study.
  
  
  OBJECTIVE
  To examine the relationship between severity of preseason hip, groin, and thigh (HGT) muscle injuries, and lumbopelvic muscle size, asymmetry, and function at the start and end of the preseason.
  
  
  BACKGROUND
  In Australian Rules Football, HGT muscle injuries have the highest prevalence and incidence. Deficits within the lumbopelvic region, such as impaired muscle function and muscle asymmetry, could contribute to injuries in the preseason, and injury could, in turn, affect muscle size and function.
  
  
  METHODS
  MRI examinations were performed on 47 male elite Australian Rules Football players at the start and at the end of the football preseason. The cross-sectional area (CSA) of multifidus, psoas major, and quadratus lumborum muscles was measured, as well as change in trunk CSA due to the function of voluntarily contracting the transversus abdominis muscle. Injuries occurring during each preseason training session were routinely recorded by the club's performance staff.
  
  
  RESULTS
  Analysis of variance indicated that players with more severe preseason HGT injuries (more training sessions missed) had significantly smaller multifidus muscle CSA compared to players with no HGT injury (P = .006). No relationship was found for size or asymmetry of the quadratus lumborum or psoas major muscles, or ability to contract the transversus abdominis muscle through drawing in of the abdominal wall (P>.05). Small multifidus muscle size at L5 predicted 5 of 6 players who incurred a more severe HGT injury.
  
  
  CONCLUSIONS
  An association between multifidus muscle size (relative to age, height, and weight) and preseason injury suggests a way to identify players at risk of severe HGT injuries. This result needs to be replicated in a larger sample before resources are committed to intervention efforts.
authors: School of Physiotherapy, Australian Catholic University, Brisbane Campus, Queensland, Australia. Julie.Hides@acu.edu.au
authors: Julie A
authors: JA
authors: Hides
authors: Cassandra T
authors: CT
authors: Brown
authors: Lachlan
authors: L
authors: Penfold
authors: Warren R
authors: WR
authors: Stanton
mesh_terms: D000328:Adult; D056352:Athletes; D001265:Athletic Injuries / Q000175:diagnosis; D001315:Australia; D006119:Groin / Q000293:injuries*; D025981:Hip Injuries / Q000175:diagnosis*; D006801:Humans; D007869:Leg Injuries / Q000175:diagnosis*; D008137:Longitudinal Studies; D008297:Male; D008403:Mass Screening; D009132:Muscles / Q000293:injuries*; D012916:Soccer / Q000293:injuries*; D055815:Young Adult