Background and Purpose: ACL reconstruction patients commonly face transient limitations in range of motion due to postoperative swelling and stiffness, along with muscle weakness and atrophy, especially in the quadriceps. A comprehensive rehabilitation program is crucial for restoring normal knee function and optimizing recovery, emphasizing exercises to address these impairments and regain strength and flexibility. The use of the flywheel resistance training has been shown to provide an increased eccentric muscle loading and improve strength. With limited research on the combined effects of isoinertial training and conventional rehabilitation, the study aims to investigate their impact on muscle power, endurance, isometric strength, and balance in postoperative ACL reconstruction patients.