Transient Osteoporosis of the Hip: A Radiologist's Perspective.

Transient osteoporosis of the hip (TOOH) is a rare disorder of unknown etiology without any antecedent history of trauma. There is a sudden onset of acute severe pain and temporary osteopenia in the joint involved with associated radiological findings of bone loss and marrow edema. Magnetic Resonance Imaging (MRI) is the gold standard imaging modality for diagnosis and disease monitoring. The major goal of this case presentation is to emphasize the necessity to add TOOH as an important differential of sudden hip pain and to review the literature on this entity.