Seventeen cases of the ipsilateral intertrochanteric fracture of the femur and 4 cases femur neck of A-K amputee were treated at the department of orthopedic surgery Korea veterans hospital from Jan. 1980 to Jun. 1990 and we got following results. l. All patients were in man with peak age at six decade, and slipping was most frequent causes of the fractures (95%). The 17 cases out 21 were intertrochanteric fracture and the remaining 4 were neck fracture. 2. Definitive osteoporotic changes were developed at the proximal portion (Singh's index II). 3. No conclusion to be drawn concerning predicition of the importance of the individual factors considered responsible for the developement of osteoporosis, i. e. age, sex, body weight, stump length and the time of amputation. 4. In 17 intertoehanteric fracture cases. The 10 cases wearing long leg prosthesis at the time of injury were injuried more severe than 7 cases not wearing. 5. Thirteen cases out of in intertorchanteric fracture treated with operation gained bone union after average 14.9 wks postoperatively and 4 cases conservative 15.5 wks of intertrochanteric and neck fracture and all 4 complications occured, 2 cases cortical fracture were developed during operative nailing procedure and others developed postoperatively fixation loss and non union of the fractured neck. 6. Severely osteoporotic cases(below Singh's index II) were treated with conservative method and multiple pining, less severely osteoporotic cases (Singh's index III) of intertrochanteric fracture treated with operative methoid (Smith-Petersen nail, Jeweet nail, compression hip screw) and we gained satisfactory results.