The high osteogenic potential in children can lead to the spontaneous regeneration of a significant bone loss, however, the site documented in the previous reports was limited to the diaphysis in long bones. We report an exceptional case of a spontaneous regeneration of the whole lateral malleolus, including epiphysis, physis, and metaphysic, after traumatic loss in a three-year-old boy. This case emphasizes the importance of attempts to save as much of the cartilaginous tissues and the periosteum as possible, which have a great osteogenic potential, in themanagement of open would in childrhood.