The goal of this clinical trial is to assess the effectiveness of isokinetic rehabilitation training under optimal stiffness in patients undergoing knee joint rehabilitation. The main questions it aims to answer are: * Does isokinetic training under optimal stiffness lead to greater force exertion compared to traditional bodyweight training? * What are the long-term (6-week) effects of isokinetic training under optimal stiffness on joint flexibility and muscle strength? Researchers will compare the effects of isokinetic training under optimal stiffness to traditional bodyweight training to see if isokinetic training produces superior improvements in muscle strength, flexibility, and overall functional recovery. Participants will: * Perform regular training sessions using a portable knee joint isokinetic trainer, customized to their optimal stiffness for maximum force exertion. * Engage in a 6-week rehabilitation program, with assessments at the beginning, and end of the study to evaluate changes in muscle strength, and functional recovery.
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Cross-sectional area of the quadriceps
Timeframe: Before 1st practice, and after 12th practice (6 weeks * 2 practices/week = 12 practices)
Cross-sectional area of the hamstrings
Timeframe: Before 1st practice, and after 12th practice (6 weeks * 2 practices/week = 12 practices)
Peak flexion and extension knee torque
Timeframe: During each practice (6 weeks * 2 practices/week = 12 practices).
Average flexion and extension knee torque
Timeframe: During each practice (6 weeks * 2 practices/week = 12 practices).
Flexion and extension knee work
Timeframe: In each ptractice (6 weeks * 2 practices /week = 12 practices).