Ucurum Sevtap Gunay, Kirmizi Muge, Umay Altas Elif, Ozer Kaya Derya
Faculty of Health Sciences, Department of Physiotherapy and Rehabilitation, Katip Celebi University, Izmir, Turkey.
Faculty of Medicine, Department of Physical Medicine and Rehabilitation, Bakircay University, Izmir, Turkey.
Somatosens Mot Res. 2024 Jun;41(2):69-76. doi: 10.1080/08990220.2023.2175809. Epub 2023 Feb 5.
PURPOSE/AIM: Knee muscles strength is an important factor influencing postural stability in patients with knee osteoarthritis (KOA). However, there is no evidence regarding the relationship between the knee flexor/extensor strength ratio, which is suggested to be a good indicator of knee stability, and postural stability. We aimed to investigate postural stability and its relation to knee flexor and extensor strength and strength symmetry in women with KOA.
Thirty-five women with unilateral KOA and thirty-five asymptomatic women were assessed with the Prokin system to collect the following parameters during quiet standing with eyes-open and eyes-closed: ellipse area, perimeter, forward-backward standard deviation, mediolateral standard deviation, the average centre of pressure displacement on the x- and y-axises (COPX and COPY), and the limit of stability (LoS) score. Higher scores mean better balance for LoS and poorer balance for other parameters. Knee flexor and extensor strength were assessed bilaterally with the Lafayette hand-held dynamometer.
The COPX during standing with eyes-closed was higher in women with KOA than controls and the LoS score was lower ( < 0.05, Cohens' = 0.72 and 0.65). Postural stability was correlated with knee muscles strength and the flexor/extensor strength ratios in both groups (r = between 0.395 and 0.456 for LoS, r = between -0.335 and -0.639 for the others, < 0.05).
Women with KOA had poorer postural stability in the mediolateral direction during standing with eyes-closed and a worse LoS score than controls. Postural stability was related to knee flexor and extensor strength and the flexor/extensor strength ratio in women.
目的/目标：膝关节肌肉力量是影响膝骨关节炎（KOA）患者姿势稳定性的重要因素。然而，尚无证据表明被认为是膝关节稳定性良好指标的膝屈肌/伸肌力量比与姿势稳定性之间的关系。我们旨在研究KOA女性的姿势稳定性及其与膝屈肌和伸肌力量以及力量对称性的关系。
使用Prokin系统对35名单侧KOA女性和35名无症状女性进行评估，以收集睁眼和闭眼安静站立时的以下参数：椭圆面积、周长、前后标准差、内外侧标准差、x轴和y轴上的平均压力中心位移（COPX和COPY）以及稳定极限（LoS）评分。LoS评分越高表示平衡越好，其他参数则表示平衡越差。使用Lafayette手持测力计双侧评估膝屈肌和伸肌力量。
KOA女性闭眼站立时的COPX高于对照组，LoS评分较低（<0.05，Cohens' = 0.72和0.65）。两组的姿势稳定性均与膝关节肌肉力量和屈肌/伸肌力量比相关（LoS的r值在0.395至0.456之间，其他参数的r值在-0.335至-0.639之间，<0.05）。
KOA女性在闭眼站立时内外侧方向的姿势稳定性比对照组差，LoS评分也更差。姿势稳定性与女性的膝屈肌和伸肌力量以及屈肌/伸肌力量比有关。
