The book covers the etiopathology of the disease including the research studies done on the different conditions associated with osteonecrosis. It will discuss in detail the various diagnostic tools including X-rays, CT scan, MRI and bone scan. Classification and staging are described at length with reference to importance in planning the treatment and correlation to prognosis. Various mimics of osteonecrosis are covered in the differential diagnosis. Association of sickle cell disease with osteonecrosis is covered in great details. Numerous illustrations have been included to ensure easy understanding of the disease. Surgical procedures are described with attention to details to ensure maximum benefit to the reader.  The book attempts to cover the entire spectrum of osteonecrosis with special emphasis on femoral head necrosis, this being the most common bone being affected.