Distinguishing transient osteoporosis from avascular necrosis of the hip.

Abstract
Transient osteoporosis of the hip is an uncommon, usually self-limited, distinct clinical entity of unknown etiology [6,8,33,34,36,38,39,48,53,55,56]. Classically, it is characterized by disabling pain in the hip without antecedent trauma and by striking radiographic evidence of osteopenia that is i