5 ADDITIONAL CASES OF LOCAL FIBROCARTILAGINOUS DYSPLASIA

Focal fibrocartilaginous dysplasia has previously been described as an etiology of genu varum deformity in children at about walking age. We have found 20 cases in the literature, and all of them were located i n the medial proximal tibial metaphysis. We report five additional cas es of this entity. The patients had a genu varum deformity, and the an gulation was at the site of the bone lesion. Four cases were in the ti bia, and one case was in the distal medial femoral metaphysis. Age at diagnosis ranged from 13 to 24 months. A cortical defect with surround ing sclerosis was observed on radiographs. The angulation usually prog ressed initially, and spontaneous resolution was observed in two cases at last follow-up. Open biopsy and tibial valgus osteotomy were perfo rmed in two cases. The unusual femoral case was also treated with open biopsy and medial hemicircumferential periosteal release. Spontaneous remodeling of varus angulation and resolution of bony defect may be e xpected in most cases, and osteotomy can be avoided.