Transient regional osteoporosis of the ankle and foot. A report of four cases and review of the literature.

Transient regional osteoporosis of the ankle and foot is an uncommon clinical entity characterized by local tenderness over the involved area. Plain radiographs demonstrate osteopenia of the involved bone and technetium diphosphonate bone imaging shows increased tracer uptake at the same location. This disorder is benign and self-limiting, and treatment is conservative.