The prevalence of Knee Osteoarthritis(KOA) is increasing, most of the kinesiotherapy is focus on improving the strength of knee muscles. However,the relationship between periarticular muscle strength of Knee and Hip in KOA in old people remains unknown.
PURPOSE: To explore the relationship between periarticular muscle strength of Knee and Hip.
METHODS: Forty patients with Knee Osteoarthritis (24females and 16males, Age:55.31±7.05years)were enrolled in the study.The Isomed-2000 dynamometer was adopted to measure the peak torque/body weight(PT/BW) and peak work/body weight(PW/BW)of knee and hip at 60(°)·s-1and180(°)·s-1, respectively. Pearson Correlation Analysis and multiple Regression analysis were used to measure the muscle strength between knee flexors-extensors and hip flexor-extensor, adductor-abductor.
RESULTS:(1)Pearson Correlation Analysis showed that in the case of 60(°)·s-1 and180(°)·s-1,the results of Isokinetic muscle strength of flexion and extension knee were correlated with the results of PT/BW and PW/BW of flexion and extension hip, adduction and abduction hip in most cases (p< 0.05);(2)Multiple regression analysis showed that there was a positive linear relationship between knee flexor, extensor and hip flexor PT/BW at 60(°)·s-1(r=3.342,p=0.002<0.05;r=2.824,p=0.007<0.05, respectively);There was a positive linear relationship between knee flexors and hip extensors (r=2.305, p<0.05). At 180(°)·s-1PW/BW,there was a negative linear relationship between hip extensor and knee flexor(r=-2.417, p=0.02<0.05),and a positive linear relationship between knee flexors and hip adductors (r=2.772, p=0.008<0.05).
CONCLUSION: In this test, the knee flexor and extensor function was affected by the same hip muscles strength.In the case of 60(°)·s-1,the hip flexor is not only involved in the knee extension function, The knee flexors are also controlled by the hip flexors.Therefore,Practitioners with KOA should not only focus on the function of the knee muscles, but also the use of the muscles around the hip joints.