2.3. Intervention
abductors, hip muscle
Group 1—exercise therapy group;Group 2—collagen supplementation;Group 3—combined intervention of exercise therapy and collagen supplementation.The exercises prescribed to both groups were:hip muscle strengthening exercises, including hip flexors, abductors, adductors, and extensors;knee muscle strengthening exercises, including dynamic quadriceps exercise, hamstring curls, gastrocnemius stretching, and squatting;cycling.