First of all, the real cause of the disease needs to be clarified, so MRI is recommended to treat the cause. You have already performed EMG examination and the result is normal, which means that the muscle nerve function is normal, so the muscle atrophy originates from joint disease. After the knee joint disease is cured, muscle atrophy can be fully recovered through muscle strength exercise. 1.Sit on the edge of the bed and let the right leg move on its own. 2.Lie on the bed without pressure exercise. 3.Massage both legs frequently. 4.You can bear less weight when standing.