Custom-made acetabular implants for revision total hip arthroplasty: postoperative evaluation of the accuracy of implant positioning

Correct positioning of customized acetabular implants could be achieved via assessment on plain AP radiographs using a superimposition method. The results were further emphasized by the low rate of mechanical complications and high implant survival. Lewinnek's safe zone is a good guideline for proper cup positioning but should not be prioritized over primary stability of the implant. Accurate planning is key to achieving both a satisfying position and sufficient osseous integration. Further research involving higher case numbers through a multi-center approach is needed to draw definitive conclusions.