An observational study on sit-stand transition and stairs activity of muscles surrounding the knee activa-tion in middle-aged and elderly women with knee osteoarthritis
10.3969/j.issn.1001-1242.2025.06.016
- VernacularTitle:中老年女性膝骨关节炎患者坐-站转换及上下台阶中膝周肌肉激活的观察性研究
- Author:
Cuihong XIA
1
;
Fei XING
;
Yang LI
Author Information
1. 西南医科大学附属医院康复医学科,四川省 泸州市,646000;自贡市第一人民医院康复医学科
- Publication Type:Journal Article
- Keywords:
knee osteoarthritis;
muscle activation;
common contraction;
surface electromyography
- From:
Chinese Journal of Rehabilitation Medicine
2025;40(6):909-916
- CountryChina
- Language:Chinese
-
Abstract:
Objective:Surface electromyography was used to observe the activation and co-contraction strategies of mus-cles surrounding the knee in female patients with knee osteoarthritis(KOA)during sitting,standing and step-ping.Method:Female KOA patients admitted to the Affiliated Hospital of Southwest Medical University from March 2023 to January 2024 were recruited.Surface electromyography was used to collect the integral EMG and root mean square values of the vastus medialis,biceps femoris,lateralis femoris,semitendinosus and rec-tus femoris of the affected side of KOA patients during the process of standing to sitting,sitting to standing,ascending and descending steps.The activation of peri-knee muscles and the change of co-contraction strategy were observed in the control group without KOA.Result:Thirty-five KOA patients and 20 control patients were recruited.From sitting to standing,the root mean square(RMS)and integrated electromyography(iEMG)activation of biceps femoris and semitendinosus in KOA group were significantly lower than those in control group(|Z|>3.097,P<0.005),and the co-contraction of hamstring/quadriceps muscle decreased(|Z|=4.164,P<0.001).From standing to sitting,KOA patients had signifi-cantly higher quadriceps and hamstring muscle activation(|Z|>3.009,P<0.005)and decreased medial/lateral co-contraction(|Z|=2.310,P<0.001).During the stair ascent initiation phase,the iEMG levels of lateral femoris,bi-ceps femoris and semitendinosus in KOA group were higher than those in control group(|Z|>2.899,P<0.005).In the following stage,iEMG levels of lateral femoris muscle and rectus femoris muscle were higher than those of control group(|Z|>2.110,P<0.005).During the stair descent initiation phase,the iEMG levels of later-al femoris,biceps femoris and semitendinosus in KOA group were higher than those in control group(|Z|>2.092,P<0.005).In the following stage,iEMG levels of lateral femoris muscle and rectus femoris muscle were higher than those of control group(|Z|>2.606,P<0.005).During stair ascent and descent activities,there was no significant difference in the co-contraction of hamstring and quadriceps,medial and lateral muscles(P>0.05).Conclusion:Middle-aged and elderly women with KOA showed changes in muscle activation intensity and common contraction strategies during functional activities,which varied according to the type of task(sit-stand,stand-sit,stairs activity).
