Objective To analysis the medium and long term effects of the quadratus femoris muscle pedicle bone graft with screw internal fixation for the treatment of femoral neck fractures in adults.Methods From March 2003 to December 2008,sixty-two patients with femoral neck fractures were operated.There were 50 males and 12 females,with an average age of 39 years (ranged from 16 to 62 years).Fifteen cases suffered from traffic accidents and 47 from falling injury.There were 8 cases which fracture site was infer-head in Garden type Ⅱ,twenty-nine cases in type Ⅲ and 25 cases in type Ⅳ.The average time were 12 hours (2-96 hours) from injured to hospital admission and 4 days (2-8 days) from injured to operation.Partial weight bearing started on 3 months postoperatively and full weight bearing on 6 months.The postoperative duration of follow up was 3 to 5 years in 39 cases.Healing of fractures and avascular necrosis of the femoral head were evaluated based on the X-ray results or MRI if necessary.The pain,function,deformity,range of motion were evaluated based on Harris joint function scores.Results Nonunion of fracture was noted in 2 cases during the follow-up period.The fracture healing rate was 96.8％.The avascular necrosis of the femoral head was noted in 6 cases (15.4％).There were statistical significant differences between 3 months of postoperation and 3 years of postoperation in the pain,function,deformity,range of motion.After 3 years of postoperation,there were excellent in 29 cases,good in 6 cases,general in 1 case,poor in 3 cases according to Harris joint function scores.Conclusion This technique is relatively simple and has high rate of fracture healing.The avascular necrosis of the femoral head rate is low.The medium-and long-term results are satisfactory.