title: Impairment of dynamic single-leg balance performance in individuals with hip chondropathy.
abstract: OBJECTIVE
  Impaired balance control has been reported in the elderly with hip osteoarthritis, yet this relationship has not been explored in young adults with hip chondropathy. This study aimed to determine whether people with hip chondropathy demonstrated impaired balance ability during a dynamic single-leg squat with eyes open (SquatEO) and a single-leg standing task with eyes closed (StandEC) and whether hip range of motion (ROM) and hip muscle strength were correlated with balance measures in adults with hip chondropathy.
  
  
  METHODS
  Sixty-three adults with hip chondropathy and 60 controls performed 2 tasks: SquatEO and StandEC while standing on a Nintendo Wii Balance Board. Center of pressure (COP) movement in mediolateral and anteroposterior directions was extracted. Hip ROM and muscle strength were measured with an inclinometer and dynamometer. Data were analyzed using an analysis of covariance and stepwise multiple regression model.
  
  
  RESULTS
  During SquatEO, greater COP mediolateral range (P = 0.023) and anteroposterior SD (P = 0.043) were observed in those with hip chondropathy compared to controls. No significant between-group differences were observed for StandEC. Hip external rotation ROM was significantly associated with mediolateral range during SquatEO.
  
  
  CONCLUSIONS
  Dynamic single-leg balance squat performance is reduced in people with hip chondropathy compared to healthy adults, but static single-leg standing balance is not. This may be reflective of reduced control of dynamic movements. Those with greater hip joint external rotation ROM appear to have worse single-leg squat balance performance. Further investigation into balance deficits associated with hip disease is necessary to establish early identification strategies and a tailored approach to rehabilitation.
authors.affiliation: The University of Queensland, Brisbane, Queensland, Australia.
authors.forename: Anna L
authors.initials: AL
authors.lastname: Hatton
authors.forename: Joanne L
authors.initials: JL
authors.lastname: Kemp
authors.forename: Sandra G
authors.initials: SG
authors.lastname: Brauer
authors.forename: Ross A
authors.initials: RA
authors.lastname: Clark
authors.forename: Kay M
authors.initials: KM
authors.lastname: Crossley
mesh_terms: D000328:Adult; D002357:Cartilage Diseases / Q000175:diagnosis* / Q000503:physiopathology / Q000601:surgery; D005260:Female; D006621:Hip Joint / Q000473:pathology* / Q000502:physiology / Q000601:surgery; D006801:Humans; D007866:Leg / Q000502:physiology*; D008297:Male; D008875:Middle Aged; D053580:Muscle Strength / Q000502:physiology; D004856:Postural Balance / Q000502:physiology*; D011597:Psychomotor Performance / Q000502:physiology*; D016059:Range of Motion, Articular / Q000502:physiology*; D055815:Young Adult