The slipped capital femoral epiphysis is characterized by a growth disturbance of the capital physi. resulting in weakening of this structure and a subsequent displacement of the femoral head on the fe moral neck. It is a rare entity in Korea and only six cases have been reported so far1-5). One of ou cases was a bilateral mild acute slips in 13 yearold boy which were treated by Hagie pinning. Th other case, a 17 year-old boy, who suffered from a moderate acute on chronic slip in his left hip an showed a typical Pistol grip deformity. He was treated by gentle closed rcduction and Knowles pi fixation with good result.