2024年12月11日 · Osteonecrosis of the femoral head, previously known as avascular necrosis (AVN) of the hip, is the most common site for osteonecrosis, presumably due to a combination of precarious blood supply and high loading when standing.

Patient history and radiographical findings correlate with Ficat stage III avascular necrosis of the hip. Avascular necrosis of the hip is more common than other sites, presumably due to a combination of precarious blood supply and high loading when standing.

Progression of right femoral head findings with enlarging subchondral lucency and sclerosis, severe articular surface collapse and secondary osteoarthritic change. The left femoral head shows subchondral change but the articular surface is preserved.

2024年7月2日 · Historically, the terms ischemic and avascular necrosis were typically reserved for subchondral (epiphyseal) osteonecrosis, whereas bone infarct referred to medullary (metaphyseal) osteonecrosis. The term avascular necrosis (and also aseptic necrosis) is usually seen in older publications.

2024年11月2日 · The Ficat and Arlet classification uses a combination of plain radiographs, MRI, and clinical features to stage osteonecrosis of the femoral head.

2024年7月9日 · The crescent sign is most often seen in the femoral and humeral head, as well as the scaphoid, lunate and talus. Radiographic features Plain radiograph. The crescent sign is seen as a curvilinear lucent subchondral line. If articular surface flattening is present, it suggests an impending articular collapse.

Subchondral cysts in the superior outer and middle third of the femoral head (pressure zone) may arise from bone contusion and synovial intrusion or osteoclastic resorption of necrotic trabeculae following avascular necrosis 1.

2023年2月28日 · Steinberg staging of osteonecrosis of the femoral head is a commonly used system (at the time of writing, mid-2016) similar to the Ficat and Arlet staging. It is based on the radiographic appearance and location of lesion.

Asymmetry of the hip joints, with reduced joint space on the right side, subchondral sclerosis, geodes, and femoral head surface irregularity. No fracture. No destructive bony lesion can be seen.

Avascualr necrosis (AVN), also called osteonecrosis or aseptic necrosis, is a condition that occurs when there is loss of blood to the bone. The femoral head is the most common location for AVN to occur. Etiology can be remembered by the following mnemonic: GIVE INFARCTS. Gaucher disease; idiopathic (Legg-Calvé-Perthes, Köhler, Chandler)