In patients with knee osteoarthritis (OA), pain and dysfunction cause a reflex inhibition on the quadriceps femoral muscle, and quadriceps weakness could accelerate damage to knee cartilage.

These included referred pain from the lumbar spine and hip joint, severe leg length discrepancy, knee ligament, quadriceps tendon and meniscal pathologies, Hoffa’s syndrome, medial plica syndrome, ...

To determine if the combined isometric contractions of knee extension/hip adduction and knee extension/hip abduction will elicit a different quadriceps and gluteus medius electromyographic (EMG) ...