Atrophy of the greater trochanter can be seen as a result of piriformis syndrome, which is caused by compression of the median nerve as it passes through the piriformis muscle or the superficial flexor of the finger. If the circularis anterior muscle is damaged, there can be impaired skin sensation in the thumb, index finger and middle finger, and there can be decreased skin sensation in the greater trochanter, which can be accompanied by atrophy of the greater trochanter. Therefore, the most common cause of pectus excavatum atrophy is injury to the median nerve, and it is the injury to the proximal part of the median nerve, which is mainly manifested as a symptom caused by forearm injury. The main treatment is to reset the fracture end and nourish the nerve to treat the symptoms can be relieved. Secondly, it is due to neurodegenerative diseases such as acromegaly causing muscle atrophy, which may include atrophy of the greater trochanter, often accompanied by fleshy jumps, which can be clearly diagnosed according to the history, physical examination and electromyography and other tests.