title: Computerized posturographic measurement in elderly women with unilateral knee osteoarthritis.
abstract: OBJECTIVE
  To identify the subtle change of postural control in elderly patients with unilateral knee osteoarthritis (OA) with computerized dynamic posturography.
  
  
  METHODS
  Twenty-two healthy women and twenty-six women with unilateral knee OA, aged 60 and over, were enrolled. The computerized posturographic measures included a weight bearing pattern during squatting and sit-to-stand, sway velocity of center of gravity (COG) during one leg standing, on-axis velocity and directional control of COG during rhythmic weight shift, rising index during sit-to-stand, end sway during tandem walk, and movement time during step up/over.
  
  
  RESULTS
  It was shown that patients bore significantly less weight on the affected side during the 30° and 60° squat and sit-to-stand. Sway velocity of COG during one leg standing was greater whereas the on-axis velocity and directional control during the front/back rhythmic weight shift were significantly lower in the patient group. The rising index during sit-to-stand was significantly lower and movement time during step up/over with the affected side was significantly longer in patients.
  
  
  CONCLUSIONS
  This study demonstrated in detail a decline of postural balance by utilizing computerized posturography in elderly women with unilateral knee OA. They had less weight-bearing, more sway, and less ability of intentional postural control on the affected side.
authors.affiliation: Department of Rehabilitation Medicine, Ilsan Paik Hospital and Institute of Sports Rehabilitation, Inje University College of Medicine, Goyang 411-706, Korea.
authors.forename: Kil-Byung
authors.initials: KB
authors.lastname: Lim
authors.forename: Hong-Jae
authors.initials: HJ
authors.lastname: Lee