A novel positioner for accurately sitting the acetabular component: a retrospective comparative study

In this study, we described a positioner which allows a combination of preoperative plan and intraoperative insertion of the cup to improve the reconstruction of the rotation center of the hip. A retrospective study was conducted on 32 consecutive patients (group A) using this positioner and 40 consecutive patients (group B) using conventional method; radiological parameters and clinical measurements before operation and at last follow-up were collected and evaluated. Group A had a reconstructed center of rotation (COR) that was 0.19 mm closer to the anatomic COR in height (P