A new method for adapting the acetabulum for installation of customized implants

Abstract

Aim to assess the accuracy and duration of acetabulum adaptation when using the developed method of installing the acetabular components of the hip joint endoprosthesis.
 Material and methods. A method and a special device for its implementation have been developed for adapting of the acetabulum with defects. An experimental study was conducted on 3D printed plastic models of pelvic bones of patients with acetabulum defects of type 2A-3B according to the Paprosky classification. In the main group, pelvic bones were treated using the developed method. The control group used Zimmer (USA) hip endoprosthesis kit cutters as well as standard surgical instruments. The accuracy of the pelvic bone treatment was evaluated by the volume of liquid silicone that was poured into the space between the endoprosthesis component and the pelvic bone. The duration of preparation of the acetabulum for cup implantation was assessed using a stopwatch.
 Results. The mean duration of pelvic bone preparation for cup implantation did not differ significantly between the groups (p = 0.7). The average volume of solidified silicone in the space between the cup and the pelvic bone model in the main group was significantly less than in the control group (p = 0.02). This indicates a high accuracy of the acetabulum adaptation. Acetabulum wall damage in control group occurred in 5 cases.
 Conclusion. The proposed method and the device for its implementation allow you to prepare the pelvic bone for implantation of a customized cup with high accuracy. Its application can simplify the complex revision operations and reduce their invasiveness.