Thigh muscle depression: 1, commonly due to various causes of muscle dystrophy, resulting in the thinning of muscle fibers, atrophy, muscle atrophy, volume reduction will appear corresponding muscle depression. It is common to see disuse atrophy, which is caused by injury or disease that leads to long time disuse of local muscles, resulting in muscle atrophy and thigh muscle depression. 2, seen in neurogenic, including lumbar spine disease and local nerve disease in the thigh, resulting in muscle atrophy and depression due to loss of muscle innervation and nerve stimulation. 3, seen in the muscle itself metabolic abnormalities, due to metabolic disease or The muscle itself is damaged, infected, swollen, resulting in muscle fiber destruction, thinning, atrophy, will also appear the corresponding muscle atrophy, appear thigh muscle depression.