Aseptic osteonecrosis of the shoulder: Etiologies, diagnosis and medical management.

Aseptic osteonecrosis of the humeral head is a multifactorial entity in which the final common pathway results in disrupted blood supply, increased intraosseous pressure, and bone death. It follows a pathologic and radiographic pattern of progression similar to that seen at the hip. Much of the information regarding the disease has been extrapolated from findings in the femoral head. In addition, many treatment modalities have been adapted from techniques used in the hip. The causative underlying factors seem to be multifactorial and can be traumatic or non-traumatic. Although clinical symptoms and the underlying cause of the disease influence the treatment of each patient, staging is the most objective criterion in determining the most appropriate treatment. Earlier identification of osteonecrosis should facilitate the management. MRI is important for asymptomatic humeral head osteonecrosis in patients with poor clinical symptom and risk factor. Conservative treatment can be effective in stages I and II, When symptoms persist and there are signs of collapse despite conservative treatment, surgical intervention is advocated.