Customized implants for acetabular Paprosky III defects may be positioned with high accuracy in revision hip arthroplasty.

Purpose: In revision hip arthroplasty, custom-made implants are one option in patients with acetabular Paprosky III defects.

Methods: In a retrospective analysis, we identified 11 patients undergoing cup revision using a custom-made implant. The accuracy of the intended position of the implant was assessed on post-operative 3D CT and compared to the pre-operative 3D planning in terms of inclination, anteversion, and centre of rotation.