title: Changes in walking and running in patients with hip dysplasia.
abstract: OBJECTIVE
  Earlier studies have suggested that the hip extension angle and the hip flexor moment in walking are affected by hip dysplasia, but to our knowledge there have been no reports on running or evaluations of self-reported health. We evaluated differences in walking, running, and self-reported health between young adults with symptomatic hip dysplasia and healthy controls.
  
  
  METHODS
  Walking and running in 32 patients with hip dysplasia, mean 34 (18-53) years old, was compared with walking and running in 32 controls, mean 33 (18-54) years old. Joint kinematics and kinetics-quantified by the peak hip extension angle and the peak net joint moment of hip flexion during walking and running-were recorded using a motion-capture system, and health was evaluated using the Copenhagen Hip and Groin Outcome Score (HAGOS).
  
  
  RESULTS
  The peak hip extension angle during walking was less in the patients than in the controls (-10.4 (SD 4.8) degrees vs. -13.2 (SD 4.5) degrees; p = 0.02). Similarly, the peak net joint moment of hip flexion during walking was lower in the patients than in the controls (0.57 (SD 0.13) N*m/kg vs. 0.70 (SD 0.22) N*m/kg; p = 0.008). In all dimensions of HAGOS, the patients scored lower than the controls. Furthermore, the hip extension angle and the net joint moment of hip flexion correlated with the HAGOS subscales pain and physical function in sport and recreation.
  
  
  CONCLUSIONS
  Patients with symptomatic hip dysplasia do modify walking and running, and we therefore suggest that the impairment found in this study should play an important role in the evaluation of later operative and training interventions.
authors.affiliation: Department of Physiotherapy and Occupational Therapy, Aarhus University Hospital, Aarhus, Denmark. julie_svj@hotmail.com
authors.forename: Julie S
authors.initials: JS
authors.lastname: Jacobsen
authors.forename: Dennis B
authors.initials: DB
authors.lastname: Nielsen
authors.forename: Henrik
authors.initials: H
authors.lastname: Sørensen
authors.forename: Kjeld
authors.initials: K
authors.lastname: Søballe
authors.forename: Inger
authors.initials: I
authors.lastname: Mechlenburg
mesh_terms: D000293:Adolescent; D000328:Adult; D000843:Ankle Joint / Q000503:physiopathology; D016022:Case-Control Studies; D006305:Health Status Indicators; D006618:Hip Dislocation, Congenital / Q000503:physiopathology*; D006621:Hip Joint / Q000503:physiopathology; D006801:Humans; D007719:Knee Joint / Q000503:physiopathology; D008875:Middle Aged; D010147:Pain Measurement / Q000379:methods; D016059:Range of Motion, Articular / Q000502:physiology; D012420:Running / Q000502:physiology*; D016138:Walking / Q000502:physiology*; D055815:Young Adult