Transient osteoporosis of the hip, foot and knee

A 54‐year‐old man with a migrating localized osteoporosis of a foot, hip, and knee over the course of two years is described. The differential diagnosis is considered in detail. Evidence of an intense uptake of 85 Sr by the right femoral head suggested diffuse osteoblastic activity in the osteoporotic area. Eight reported cases, including the present case of recurrent osteolysis of the hip, knee, or foot, suggest that transient osteoporosis of the hip and migrating osteolysis of the lower extremity are variations of the same apparent neurovascular disorder.