The Weismann-Netter syndrome is a rare, heritable dysplasia of anterior bowing of tibiae and fibulae, often with lateral bowing of femora, short stature, and mild mental retardation. The condition is probably due to a primary metabolic abnormality of bone. The disease process is inactive in the adult. The pathogenesis is unknown. The patient reported here is the only child described in the Anglo-American literature.