[Solitary bone cysts of the ulna (author's transl)].

The solitary bone cysts occurs most frequently in the upper humerus and femur in 75% of the cases, and it is very seldom located in the ulna, in 0.5--1.5%. This report deals with the treatment results of two children, five and six years old, suffering from solitary bone cysts of the lower end of the ulna. In one case a subtotal resection of the cyst was carried out and the defect was bridged with an autologous iliac bone graft. In the other case the patient was treated by curettage, and the defect was filled in with an autologous bone graft and cancellous bone out of the tibia. In both cases complete cure of the tumorlike lesion was obtained and no loss of function or deformity of the forearm was observed 12 and 16 years after operation. In the X-ray picture at that time there was no alteration on the length, form or structure of the bone.