The authors analyzed 28 trochanteric fractures treated by compression hip screw and additional Knowles or Crane pin fixations at the Our Lady of Mercy Hospital, Catholic University Medical College from January 1987 through December 1991. The results were as follows; 1. There were 14 men and 14 women with mean age of 64.9 years. 2. The most common cause of fracture was slip down(17 cases; 60.7%) followed by traffic accident (6 cases; 21.4%) and fall from height (5 cases; 17.9%). 3. Follow-up period was minimum 5 and maximum 25 months. 4. Most of fractures were Tronzo type III & IV (23 cases; 82.1%). 5. The union time ranged from 8to 16 weeks (av. 10.6 weeks). 6. The slippage of lag screw was measured from 2 to 17mm with mean of 3.4mm. 7. The mean neck-shaft angle at last follow-up was 134° with the range of 120° to 148°. At last follow up, the loss of neck-shaft angle ranged from 5° to 13° (av. 6.4°) in 13 cases. 8. As a result, the authors concluded that internal fixation using compression hip screw and an additional pin after anatomic stable reduction is one of good methods which accelerate fracture healing and reduce the incidence of malunion by preventing rotation of fracture fragment.