In the chronic osteomyelitis of the ilium the infection is often so diffuse that removing all sequestra and small cavities are practically impossible. Either the partial or total resection of the ilium has been thought as a standard method of treatment in these situations. According to authors experience, the partial resection is not sufficient for removing such diffuse lesions, and all the patients that underwent the total resection of the ilium have been suffering from the instability with severe Trendelenburg gait because of the loss of the abductor origin. These results are far from a satisfactory one in modern orthopedic field in which many reconstructive surgeries have been done for the disabled patients. Removal of only one cortex followed with the closed suction irrigation technique are applied in three cases. The result of this operation is as good as that removing the total ilium in controlling the infection, and there are no patients who are suffering from the gait disturbance. The inner or outer cortex could be safely and widely removed without affecting the hip joint of the affected side.