title: [More muscle mass in men: explanatory model for superior outcome after total hip arthroplasty].
abstract: BACKGROUND
  Men show better functional results after total hip arthroplasty (THA). The aim of this study was a patient-specific analysis of the hip joint muscles in comparison to the joint geometry.
  
  
  METHODS
  In this study 93 computed tomography (CT) scans of the pelvis (45 men, 48 women) were analyzed to determine hip joint geometry and the volume of the gluteus medius (GMV), gluteus maximus (GXV) and tensor fasciae latae (TFL) muscles. The abduction muscle volumes were analyzed with respect to patient-specific adduction moments.
  
  
  RESULTS
  The absolute total volume of the hip muscular system (TMV) was larger in men than in women (1913 ccm vs. 1479 ccm; p <0.0001). Men exhibited a more progressive increase of muscle volume as the adduction moment increases.
  
  
  CONCLUSIONS
  Men have a greater abduction muscle mass in order to balance adduction moments occurring in the hip joint and therefore have more muscle mass to compensate the inevitable intraoperative muscle damage during THA. This argument supports the extraordinary importance of muscle sparing surgical techniques in women.
authors: Klinik für Orthopädie, Centrum für Muskuloskeletale Chirurgie, Charité-Universitätsmedizin Berlin, Charitéplatz 1, 10117 Berlin, Deutschland. Bernd.Preininger@charite.de
authors: B
authors: B
authors: Preininger
authors: K
authors: K
authors: Schmorl
authors: P
authors: P
authors: von Roth
authors: T
authors: T
authors: Winkler
authors: G
authors: G
authors: Matziolis
authors: C
authors: C
authors: Perka
authors: S
authors: S
authors: Tohtz
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019644:Arthroplasty, Replacement, Hip / Q000706:statistics & numerical data*; D005260:Female; D005858:Germany / Q000453:epidemiology; D006622:Hip Prosthesis / Q000706:statistics & numerical data*; D006801:Humans; D007593:Joint Instability / Q000453:epidemiology / Q000503:physiopathology* / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D018482:Muscle, Skeletal / Q000000981:diagnostic imaging / Q000503:physiopathology*; D009929:Organ Size; D059351:Organ Sparing Treatments / Q000706:statistics & numerical data*; D015995:Prevalence; D011859:Radiography; D012307:Risk Factors; D017678:Sex Distribution; D016896:Treatment Outcome; D055815:Young Adult
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