Postural balance in individuals with knee osteoarthritis during stand-to-sit task

Fu, S, Duan, T, Hou, M, Yang, F, Chai, Y, Chen, Y, Liu, B, Ma, Y, Liu, A ORCID:, Wang, X and Chen, L 2021, 'Postural balance in individuals with knee osteoarthritis during stand-to-sit task' , Frontiers in Human Neuroscience, 15 , p. 760960.

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Objective: Stand-to-sit task is an important daily function, but there is a lack of research evidence on whether knee osteoarthritis (knee OA) affects the postural balance during the task. This study aimed to compare individuals with knee OA and asymptomatic controls in postural balance and identify kinematic and lower extremity muscle activity characteristics in individuals with knee OA during the stand-to-sit task. Methods: In total, 30 individuals with knee OA and 30 age-matched asymptomatic controls performed the 30-s Chair Stand Test (30sCST) at self-selected speeds. Motion analysis data and surface electromyography (sEMG) were collected while participants performed the 30sCST. To quantify postural balance, the displacement of the center of mass (CoM) and the peak instantaneous velocity of the CoM were calculated. The kinematic data included forward lean angles of the trunk and pelvic, range of motion (RoM) of the hip, knee, and ankle joints in the sagittal plane. The averaged activation levels of gluteus maximus, vastus lateralis, vastus medialis, rectus femoris, biceps femoris (BF), tibialis anterior (TA), and medial head of gastrocnemius muscles were indicated by the normalized root mean square amplitudes. Results: Compared with the asymptomatic control group, the knee OA group prolonged the duration of the stand-to-sit task, demonstrated significantly larger CoM displacement and peak instantaneous CoM velocity in the anterior-posterior direction, reduced ankle dorsiflexion RoM, greater anterior pelvic tilt RoM, and lower quadriceps femoris and muscles activation level coupled with higher BF muscle activation level during the stand-to-sit task. Conclusion: This study indicates that individuals with knee OA adopt greater pelvic forward lean RoM and higher BF muscle activation level during the stand-to-sit task. However, these individuals exist greater CoM excursion in the anterior-posterior direction and take more time to complete the task. This daily functional activity should be added to the rehabilitation goals for individuals with knee OA. The knee OA group performs reduced ankle dorsiflexion RoM, quadriceps femoris, and TA activation deficit. In the future, the rehabilitation programs targeting these impairments could be beneficial for restoring the functional transfer in individuals with knee OA.

Item Type: Article
Contributors: Granacher, U (Editor), Sarabon, N (Reviewer) and Jafarnezhadgero, AA (Reviewer)
Additional Information: ** From Frontiers via Jisc Publications Router ** Licence for this article: **Journal IDs: eissn 1662-5161 **History: published_online 03-11-2021; accepted 04-10-2021; submitted 28-08-2021; collection 2021
Schools: Schools > School of Health and Society
Journal or Publication Title: Frontiers in Human Neuroscience
Publisher: Frontiers Media
ISSN: 1662-5161
Related URLs:
Funders: National Natural Science Foundation of China, National Joint Engineering Research Center of Rehabilitation Medicine Technology
SWORD Depositor: Publications Router
Depositing User: Publications Router
Date Deposited: 18 Nov 2021 10:41
Last Modified: 15 Feb 2022 17:05

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