Abstract: [Objective] To evaluate the clinical effect of total hip arthroplasty with retaining internal fixator for traumatic arthritis of acetabular fracture.[Methods] Clinical data of 62 patients with traumatic arthritis due to acetabular fracture treated with total hip from March 2014 to May 2019 were retrospectively analyzed. 27 cases in the retention group, 35 cases in the removal group.Perioperative, follow-up and imaging data of the two groups were compared.[Results] The retention group was better than the removal group in operation time, incision length, intraoperative blood loss,blood transfusion rate and postoperative drainage (P<0.05).Complications were 37.03%(10/27) in the retention group and 34.28% (12/35) in the removal group, with no significant difference (P>0.05).The two groups were followed up for 2-7 years, with an average of (4.41±2.23) years.The time of walking and full weight-bearing activity in the retention group was earlier than that in the removal group (P<0.05).As time went on, Harris score and hip extension ROM increased between the two groups (P<0.05), while there was no significant difference between the two groups at the same time (P>0.05).At the last follow-up, there was no statistical significance in the difference of prosthesis Angle and limb length between the two groups (P>0.05).[Conclusion] Total hip arthoplasty with retained internal fixation for traumatic arthritis of acetabular fracture is feasible and effective, but the complications are high，and adequate preoperative preparation is needed.