Bone, regardless of its type or location, is a highly vascular structure
with unique features in its internal blood flow. Changes that occur in
blood flow through bone have important implications in disease, and
several attempts have been made to correlate vascular patterns with the
clinical incidence of osteonecrosis. Examination of the arterial anatomy
of bones that undergo osteonecrosis in other regions of the body has
allowed identification of types of vascular interruptions that place
particular bones at risk. Although the role of an impaired blood supply
of the femoral head in the pathogenesis of osteonecrosis has not been
clarified, several studies have found abnormal blood supply in patients
with osteonecrosis
