Osteonecrosis is not confined to the femoral head, it can occur anywhere in the body, but the unique “temperament” of the femoral head seems to be particularly favored by osteonecrosis, which is why osteonecrosis of the femoral head is more common. Why is osteonecrosis of the femoral head the most common? The main reasons are as follows: 1, hormonal drugs: long-term use of a large number of adrenocortical steroids (such as: prednisone, dexamethasone and so on), can cause osteoporosis, arterial vascular obstruction, so that bone cells, bone marrow cells gradually necrosis. 2, hip injury (including hip dislocation, femoral neck fracture, rotor fracture, etc.) directly affects the local blood supply, especially the lack of blood supply to the femoral head, resulting in femoral head necrosis. In hip dislocation combined with fracture, the necrosis rate is as high as 90%. If the fracture dislocation is not rectified for more than 24 hours, necrosis of the femoral head will occur 100%. 3, trauma: femoral neck fracture, sprain, fall, hip dislocation, acetabular insufficiency are prone to femoral head necrosis, the incidence is generally 75%-95%, most of the fracture surgery can occur osteonecrosis osteonecrosis location is not bound to the femoral head, it can occur in any part of the body, but the unique “temperament” of the femoral head It can occur anywhere in the body, but the unique “temperament” of the femoral head seems to be particularly favored by osteonecrosis, so osteonecrosis of the femoral head is more common. Why is osteonecrosis of the femoral head the most common? The main reasons are as follows: 1, hormonal drugs: long-term use of large amounts of adrenocortical steroids (such as: prednisone, dexamethasone and so on), can cause osteoporosis, arterial vascular obstruction, so that bone cells, bone marrow cells gradually necrosis. 2, alcoholism Long-term heavy drinking is another common cause of femoral head necrosis, alcoholics should be alert to the occurrence of femoral head necrosis when hip pain occurs. 3, hip injury (including hip dislocation, femoral neck fracture, etc.) directly damage the local blood supply, especially the femoral head of insufficient blood supply, and cause femoral head necrosis. Hip dislocation combined with fracture. For the diagnosis of early osteonecrosis, the clinic mainly relies on MRI, which is the gold standard for the diagnosis of osteonecrosis, in addition to bone scan, etc. For middle and late osteonecrosis, X-ray and CT can be used for the diagnosis. For patients diagnosed with osteonecrosis, there is no need to be pessimistic, this is not some “undead cancer”, nowadays medical treatment can adequately deal with this demon and let you resume a normal life, various surgeries for preserving the femoral head in the early stage and the maturity of artificial joint surgery in the late stage have let patients with osteonecrosis see the light.