Abstract: Abstract： Objective To study the effects of different ranges of isokinetic quadriceps training for improving the func⁃ tion of knee joint after total knee arthroplasty (TKA)， and provide the theoretical and clinical experiences for the early reha⁃ bilitation of TKA．Methods A total of 73 TKA cases were randomly allocated into 3 groups for isokinetic quadriceps train⁃ ing with ranges of 0°- 30° (n=25), 31°- 60° (n=24) and 61°- 90° (n=24)．The isokinetic quadriceps training was for two months. The isokinetic muscle strength and the IKS scores were recorded before and after the training in three groups. Re⁃ sults After training, the isokinetic muscle strength increased significantly in three groups (P < 0.05). The IKS scores in⁃ creased significantly only in 0°-30° training group after training (P < 0.05). There was no significant difference in IKS score before and after training in 31°-60° group and 61°-90°group. The IKS score after training was positively correlated with the isokinetic muscle strength only in 0°-30° group (P < 0.05). Conclusion After TKA, isokinetic quadriceps training with a 0°-30° range of motion can improve the strength of quadriceps and the knee function．

Key words: total knee arthroplasty, isokinetic training, knee function, quadriceps