OWL: OCOSH Classification/Bone Diseases/Osteonecrosis

Avascular Necrosis Osteonecrosis

Not Available — 2008-03-23 09:09:22 GMT

Nucleus Medical Art
Illustrations and account of the condition
Avascular necrosis is a disease resulting from the temporary or permanent loss of the blood supply to the bones. Without blood, the bone tissue dies and causes the bone to collapse. If the process involves the bones near a joint, it often leads to collapse of the joint surface. This disease also is known as osteonecrosis, aseptic necrosis, and ischemic bone necrosis. Although it can happen in any bone, avascular necrosis most commonly affects the ends (epiphysis) of long bones such as the femur, the bone extending from the knee joint to the hip joint. Other common sites include the upper arm bone, knees, shoulders, and ankles. The disease may affect just one bone, more than one bone at the same time, or more than one bone at different times.

AVN of the femoral head in SCD

Hernigou et al. — 2007-01-03 09:09:22 GMT

Avascular necrosis of the femoral head in sickle-cell disease. Treatment of collapse by the injection of acrylic cement. Hernigou P, Bachir D, Galacteros F. Henri Mondor Hospital, Creteil, France. In ten patients with sickle-cell disease, we used a new technique of cement injection for the treatment of 16 painful hips with a radiographic crescent line or flattening of the articular surface due to avascular necrosis. The necrotic bone and overlying cartilage are elevated by the injection to restore the sphericity of the femoral head. Five days after the operation, full weight-bearing was allowed with the help of crutches for three weeks. The time in hospital averaged eight days; the average blood loss was 100 ml. There was early pain relief and postoperative radiographs showed improvement in the shape of the femoral head. At a mean follow-up of 5 years (3 to 7), 14 of the 16 hips were still improved although some gave slight pain. Only two hips had required revision to total hip arthroplasty, at one year and two years respectively. The increasing longevity of patients with sickle-cell disease means that avascular necrosis will be an increasing problem. Total hip replacement has a poor prognosis because of the risks of infection, high blood loss, and early loosening. Cement injection does not have these problems and allows for earlier, more conservative surgery. (full text)

Bone Necrosis

Not Available — 2002-01-31 09:09:22 GMT

Bone Necrosis Contents
Definition Incidence Aetiology Pathology Clinically Investigations Hip Knee Lunate Osteochondritidies Crushing Osteochondritidies Splitting Osteochondritidies Pulling Osteochondritidies

Perspectives on Osteonecrosis

Hungerford — 2008-03-13 09:09:22 GMT

Presentation by D Hungerford 2003