Short-term clinical efficacy of three dimension printed titanium augments for the reconstruction of acetabular bone defects in revision total hip arthroplasty

Abstract

Objective To evaluate the short-term clinical efficacy of three dimension printed titanium augments for the reconstruction of acetabular bone defects in revision total hip arthroplasty. Methods The retrospective study was conducted. To retrospectively analyze clinical data of 21 patients who were underwent revision total hip arthroplasty with severe acetabular bone defects reconstructed by three dimension printed titanium augment from March 2016 to September 2017 from Department of Orthopaedics, Beijing Friendship Hospital, Capital Medical University. There were 9 males and 12 females, age (58.9±6.3) years, 51-67 years, body mass index (23.8±2.9) kg/m2. According preoperative CT scan of hip joints, three dimension printed titanium augments were designed for acetabular defects personality. The data including the vertical distance from centre of rotation to the interteardrop line in X-ray examination, preoperative Harris score, final follow-up Harris score of hip postoperatively, and complications were recorded. Outpatient visits ranged from 11.8 to 19.6 months. Measurement data were expressed as (Mean±SD), and t test was used before and after surgery. Results For X-ray examination, the average vertical distance from centre of rotation to the interteardrop line was (6.1±1.2) cm preoperatively and (2.8±0.7) cm postoperatively, and the difference was statistically significant(P<0.01). The hip Harris score increased from preoperative (47.5±6.4) scores to the last follow-up (84.6±5.9) scores, and the difference was statistically significant (P<0.01). The final follow-up data showed the acetabular prosthesis and augments were stable, while there were no hip joint dislocation, periprosthetic joint infection, loosening of acetabular components and other complications. Conclusion Three dimension printed augments can reconstruct severe acetabular bone defects and restore the hip rotation centre. Key words: Arthroplasty, replacement, hip; Prosthesis failure; Acetabulum; Osteolysis; Recovery of function