Transient osteoporosis of the hip.

The authors report 6 cases of transient osteoporosis of the hip. This is a rare disease but it should nevertheless be taken into account in the differential diagnosis with other inflammatory or neoplastic diseases of the hip. Even without treatment, it tends to regress spontaneously, but the pain can sometimes last for several months. Calcitonin is a reliable therapeutic agent and considerably shortens the natural course of the disease.