title: [Functional gait adaptations in patients with painful hip].
abstract: OBJECTIVE
  This prospective study was conducted to analyze the mechanisms of gait compensation in patients with painful hip and to search for correlations with preoperative clinical and radiographic findings.
  
  
  METHODS
  Optoelectronic and multicomponent force-plate datas were used to calculate joint motion, moments and intersegmental forces for 26 patients with unilateral hip pain and 20 normal age and sex-matched patients. Height was similar in the two groups but mean weight in the study group (83 kg) was greater than in the controls (68 kg). The preoperative Harris score was 53 in the study group and 16 patients had a permanent flexion contracture of the knee (mean 15 degrees, range 5-30 degrees). Radiographically, there were 22 cases of osteo-arthritis hip disease and 4 cases of necrosis.
  
  
  RESULTS
  Gait analysis showed a significant 0.66 +/- 0.06 m (12 p. 100) reduction in step length. Patients who had severe hip pain walked with a decreased dynamic range of motion (18 +/- 5 degrees, p<0.0001) with a curve reversal as they extended the hip. They also reduced dynamic range of motion of the knee and ankle. Patients who presented a reversal in their dynamic hip range of motion had a greater passive flexion contracture and a greater loss in range of motion during gait than those with a smooth regular pattern (p<0.0001). Patients with hip pain walked with significantly decreased external extension, adduction, and internal and external rotation moments (p<0.0001). They also unloaded the ipsilateral knee and ankle. The decreased hip extension moment was significantly correlated with an increased level of pain (p<0.0001). There was no correlation with radiological findings.
  
  
  CONCLUSIONS
  Reversal of dynamic hip range of motion was interpreted as a mechanism to increase effective hip extension during stance phase through increased anterior pelvic tilt and lumbar lordosis.
  
  
  CONCLUSIONS
  Patients with painful hip walked with a manner that was asymmetric. These gait modifications were related to hip limitation in passive motion and pain. Patients with flexion contracture adopted a compensatory gait mechanism. This study confirms relation between hip pain and forces across the hip joint.
authors.affiliation: Département d'Orthopédie, CHU de Caen, 14033 Caen Cedex.
authors.forename: C
authors.initials: C
authors.lastname: Hulet
authors.forename: D E
authors.initials: DE
authors.lastname: Hurwitz
authors.forename: T P
authors.initials: TP
authors.lastname: Andriacchi
authors.forename: J O
authors.initials: JO
authors.lastname: Galante
authors.forename: C
authors.initials: C
authors.lastname: Vielpeau
mesh_terms: D000222:Adaptation, Physiological; D000843:Ankle Joint / Q000503:physiopathology; D001827:Body Height; D001835:Body Weight; D016022:Case-Control Studies; D003286:Contracture / Q000503:physiopathology; D004582:Electronics, Medical / Q000295:instrumentation; D005260:Female; D005271:Femur Head Necrosis / Q000000981:diagnostic imaging / Q000503:physiopathology*; D005684:Gait / Q000502:physiology*; D006621:Hip Joint / Q000000981:diagnostic imaging / Q000503:physiopathology*; D006801:Humans; D007719:Knee Joint / Q000503:physiopathology; D008141:Lordosis / Q000503:physiopathology; D008159:Lumbar Vertebrae / Q000503:physiopathology; D008297:Male; D008875:Middle Aged; D055095:Optics and Photonics / Q000295:instrumentation; D015207:Osteoarthritis, Hip / Q000000981:diagnostic imaging / Q000503:physiopathology*; D010384:Pelvic Bones / Q000503:physiopathology; D011187:Posture / Q000502:physiology; D011446:Prospective Studies; D011859:Radiography; D016059:Range of Motion, Articular / Q000502:physiology; D012399:Rotation; D013314:Stress, Mechanical