Disorder of Muscles around Knee with Meniscus Injury: Study with Surface Electromyography / 中国康复理论与实践

ABSTRACT

Objective:To investigate the influence of meniscus injury on the function of muscles around knee in patients with meniscus injury. Methods:From February, 2017 to February, 2018, the suface electromyography of vastus lateralis (VL), rectus femoris (RF), vastus medialis (VM) and biceps femoris (BF) were recorded and analyzed in 22 patiens with unilateral meniscus injury, during squatting down-standing up test and maximal isometric voluntary contraction at knee flexing 70°. Results:During squatting down-standing up test, the average electromyography (AEMG) of VL and BF was less in affected knee than in unaffected knee (t > 3.945, Z > 3.847, P < 0.001), and the coactivity ratio of hamstrings in affected knee was higher (t > 3.650, P < 0.01). The AEMG of VL, RF, VM and BF was less in affected knee than in unaffected knee (t > 2.907, Z = 4.107, P < 0.01) during maximal isometric voluntary contraction at knee flexing 70°. Conclusion:sEMG can be used to quantitatively evaluate the muscle function around knee for patients with meniscus injury in different motion states. Patients with meniscus injury demonstrate impaired muscular function and altered muscle balance around knee, which need to be corrected during rehabilitation.