Ischemic osteonecrosis can occur not only in the femoral head, but also in other parts of the body such as the knee, shoulder, and wrist joints, although the incidence is relatively low compared to the femoral head. Hormones, alcohol, and trauma can also cause osteonecrosis in these areas. The incidence of osteonecrosis of the knee joint is second only to the femoral head, the application of corticosteroids is a common cause, alcohol, trauma can also be caused. Its clinical characteristics are knee joint pain, obvious after activity, but some patients may not have symptoms. As more than 90% of patients with osteonecrosis of the knee have osteonecrosis of the femoral head at the same time, so for patients with non-traumatic osteonecrosis of the femoral head (especially hormonal), if the cause of sudden pain in the knee is unknown, osteonecrosis of the knee should be highly suspected, and imaging tests such as MRI are needed to make an early and clear diagnosis. 2, osteonecrosis of the shoulder joint The cause of humeral head necrosis of the shoulder joint is the same as that of osteonecrosis of the femoral head, which occurs in the upper part of the head. The first symptom of humeral head necrosis is pain, mainly related to the activity, the course of the disease is progressive, late stage can have resting pain. Physical examination may reveal atrophy of the deltoid and rotator cuff muscles, and active and passive activities are limited, especially forward flexion and abduction, and sometimes an intra-articular popping sound may be detected. The treatment principle can also refer to osteonecrosis of the wrist joint 3, osteonecrosis of the wrist joint is mainly related to trauma and strain, but non-traumatic factors can also cause osteonecrosis of the wrist joint, such as high-dose application of steroid hormones. Osteonecrosis of the wrist joint mainly occurs in the lunar and navicular bones, the lunar bone is more common, which may be related to the local anatomical location. Osteonecrosis of the lunar bone is often associated with a history of trauma or strain, mostly in young women. Swelling and pain in the wrist, restricted wrist movement, especially dorsal extension of the wrist is most obvious, and the 2nd and 3rd metacarpal bones may have longitudinal buckling pain. Imaging MRI can be used for early diagnosis. Early treatment is based on conservative treatment with local physical therapy and plaster immobilization. Late surgical treatment includes microsurgery such as proximal row carpal osteotomy and lunate osteotomy. Ischemic necrosis of the navicular bone has a history of trauma, wrist pain, aggravated by activity, painful local swelling, and significant pressure pain. Treatment is the same as lunar osteonecrosis.4. Ankle osteonecrosisThe cause of ankle osteonecrosis is mainly related to trauma, but non-traumatic factors hormones, alcohol and some diseases (SLE, hyperlipidemia, etc.) can also cause ankle osteonecrosis. The main manifestations are soreness and discomfort in the ankle, significant pain, and claudication in the late stage. MRI can be used for early diagnosis. Treatment principles can also refer to osteonecrosis of the femoral head.5. Osteonecrosis of the backbone is mainly seen in diseases with high-dose application of steroid hormones, and mostly coexists with osteonecrosis of the joints, which does not necessarily show obvious pain and other symptoms, and is usually detected during the examination of osteonecrosis of the joints. MRI is the main diagnostic tool. If there are no obvious complications, conservative treatment can be used, such as pain relief and observation.