The clinical observation was to investigate the effect of particulate cancellous bone impaction grafting in combination with THA for acetabular reconstruction in patients with posttraumatic arthritis and bone loss after acetabular fractures.15 consecutive cases with unilateral acetabular fracture were treated with bone impaction grafting in combination with THA in our institution.The patients included 10 men and 5 women with a mean age of 48.2 years (range from 36 to 73 years) at the time of operation.There were 8 left hips and 7 right hips and the average age of the patients at injury was 28 years (range from 18 to 68 years).The mean follow-up period was 4.3 years (range from 2 to 7 years).Compared to average 42 points (range from 10 to 62 points) of the preoperative Harris score,the surviving cases at the final follow-up had a mean HHS of 84 points (range from 58 to 98 points).One patient had mild pain in the hip.No revision of the acetabular or femoral component was undertaken during the follow-up.Normal rotational centre of most hips was recovered and in 2 cases the centre was 0.8mm higher than that in the other side.All of them had a stable radiographic appearance.Progressive radiolucent lines were observed in 2 cases in zone one and three.One hip had a nonprogressive radiolucent line in zone three.7 years after surgery there was an evident progressive displacement of 6mm with cup prosthesis,but it had not been revised.As mentioned above,particulate cancellous bone impaction grafting in combination with THA as a biological solution is an attractive procedure for acetabular reconstruction in patients with posttraumatic arthritis and bone loss after acetabular fractures,which not only restores acetabular bone stock but also repairs normal hip anatomy and its function.