The Inyo nail is a new intramedullary device for the treatment of the lateral malleolus. fracture of the ankle with the advantage of rigid fixation. The authors have experieced 16 cases of the Inyo nailing for the ankle fracture and fallowed more than 1 year in the 11 of them. Two groups of patients were evaluated; Group I was treated with the Inyo nail and Group II was treated by conventional technique. The following results were obtained; 1. The Inyo nail was suitable for treatment of type A & B fractures of the ankle. 2. Group I patients resumed their preinjury ROM of the ankles and activity earlier than Group II. 3. The results in the radiographic rating and fuctional criteria were excellent in those cases of Group I than those of Group II.