ABSTRACT
Clinical, experimental and histopathological studies were done on fifteen patients and four rabbits to illustrate the effect of hemicircumferential periosteal release on the growth of long bones. The clinical material included fifteen patients with bow legs deformity, their ages ranged between 2-5 years [with an average of 3.5 years] and the experimental material included four rabbits, each was five weeks of age. The procedure was done on ten patients [five were considered as control cases] and four rabbits [one leg operated and the other leg is considered as the control case]. The results were encouraging, correction of Bow legs occurred within 6-8 months after operation. Also, growth changes occurred in tibia of experimental animals and histopathological changes were observed in the growth plate adjacent to the divided periosteum