Effect of total knee arthroplasty on isokinetic muscle strength curve in knee joint of the aged
Objective To explore the influence of total knee arthroplasty(TKA)on the isokinetic muscle strength curve of knee joints in the aged.Methods Patients underwent TKA one year after surgery and healthy people who matched in age and sex were selected.Isometric and isokinetic strength of knee flexion and extension at velocity of 180°/s and 60°/s was tested by isokinetic dynamometer.The peak moment and hamstring/quadriceps ratio(H/Q)of flexion and extension muscles were collected,normalized torque-angle curves(torque/body mass)were generated in steps of 1°.Results At 180°/s for patients after TKA,the flexion moment of the affected side was lower than that of the healthy side in the range of 16° to 64° and lower than that of the same side of the healthy subjects in the range of 10° to 83°(P＜0.05);at 60°/s,the flexion moment of the affected side was lower than that of the healthy side in the range of 72° to 76° and lower than that of the healthy subjects in the range of 59° to 87°(P＜0.05).There were also no significant differences in knee extension moment,the peak moment and H/Q between the affected side of patients and healthy subjects at 180°/s(P＞0.05);at 60°/s,the knee extension moment on the affected side was lower than that on the healthy side in the range of 68° to 85°,and lower than that of the healthy subjects in the range of 18° to 37° and 72° to 81°,the H/Q on the affected side was higher than that of the healthy subjects(P＜0.05).There was no significant difference in the peak moment and extension moment of isometric test between the affected side and the healthy subjects(P＞0.05).Conclusions After total knee arthroplasty,the hamstring strength of the affected side decreased during high-speed and low-speed within the end range of joint movement,and the quadriceps strength of the affected side decreased during low-speed within the starting range of joint movement.
Total knee arthroplastyIsokinetic muscle testKneeKnee osteoarthritis
万方数据
维普
