| Objective: To observe the characteristics of quadriceps muscle strength, nerve domination and hip joint movement during walking in elderly patients with knee osteoarthritis (KOA). Methods: A total of 18 KOA patients were selected as the observation group, and 8 patients without KOA were selected as the control group. The age, height, weight and body mass index ( BMI ) of the two groups were matched. The isokinetic muscle strength test, wireless surface electromyography test and gait test were performed in both groups. The integral electromyography (iEMG), mean square root (RMS), average power frequency (MPF) and peak torque (PT), medial vastus muscle (VM), lateral femoral muscle (VL) and rectus femoris (RF) and peak hip inward and outward angles were selected to analyze the correlation between quadriceps femoris function and kinematic characteristics of hip joint during walking by independent sample t test or Mann Whitney rank sum test. Results: The PT value of quadriceps femoris in KOA patients was significantly lower than that in the control group at isometric and isokinetic exercise (P<0.01). The RMS value of surface electromyography in VL at 60 °/s isometric contraction was significantly higher than that in the control group (P<0.05). The RMS value of surface EMG in RF at 180 °/s isometric contraction was significantly higher than that in the control group (P<0.01). The peak hip adduction and abduction angles during walking were significantly lower than those in the control group (P<0.05).There was no correlation between quadriceps muscle strength and hip kinematics. Conclusion: The muscle strength of quadriceps femoris in KOA group was significantly lower than that in the control group, and the innervation efficiency during activity was significantly decreased, and the peak hip adduction and abduction angles during walking were significantly reduced. The quadriceps muscle strength is not correlated to the kinematic of the hip joint during walking. |
