Analysis on Characteristics of Isokinetic Muscle Strength of the Healthy Lower Limb and Muscle Activity During Single-Leg Jumping Movements in Patients with Acute Non-Contact Anterior Cruciate Ligament Injury
10.16156/j.1004-7220.2025.02.004
- VernacularTitle:非接触性前交叉韧带损伤患者急性期健侧下肢等速肌力和单腿跳跃动作肌肉活动特征分析
- Author:
Jing RAN
1
;
Xiaobing LUO
1
;
Jie XU
1
;
Liangliang YOU
1
Author Information
1. 四川省骨科医院,成都 610041
- Publication Type:Journal Article
- Keywords:
anterior cruciate ligament injury;
isokinetic muscle strength;
surface electromyography;
single-leg jumping
- From:
Journal of Medical Biomechanics
2025;40(2):278-283
- CountryChina
- Language:Chinese
-
Abstract:
Objective The isokinetic muscle strength indicators and surface electromyography(sEMG)signals of the healthy lower limb side of patients with non-contact anterior cruciate ligament(ACL)injury in the acute phase were compared with those of healthy individuals,so to provide a theoretical basis for the prevention of secondary ACL rupture in the healthy lower limb side of patients with ACL injury.Methods 21 patients with ACL injury in the acute phase(ACL injury group)and 21 healthy individuals(control group)were subjected to isokinetic muscle strength tests for hip flexion,extension,adduction,abduction,and knee flexion,and sEMG signals of the vastus medialis,vastus lateralis,semitendinosus,biceps femoris,and gluteus maximus were collected during the single-leg jumping movements.The differences between the two groups in relative peak torque,antagonist muscle ratio,root mean square amplitude,and co-contraction index were analyzed by independent sample t-test.Results The extension of the knee(P=0.040)and hip flexion strength(P=0.041)were lower in the healthy lower limb side of patients with ACL injury.In the single-leg landing action,there were lower activation of the vastus medialis muscle in the pre-activation phase(P=0.014),lower activation of the vastus medialis(P=0.030)and gluteus maximus(P=0.002)in the reaction phase,and also lower co-activation levels of the biceps femoris-semitendinosus(P=0.020).Conclusions At the early stage of injury,the function of the healthy lower limb side of patients with ACL injury changes,which may indicate why these patients face a greater risk of contralateral lower limb injury.
