Group A included 51 TKAs performed with patient-specific cutting guides and conventional metal instruments. posterior-stabilised knee prosthesis (Symbios, CH), with a similar protocol and identical operating room setup. In this case-control, retrospective chart review, all TKAs were performed by one senior surgeon, using the F.I.R.S.T. This case-control study compared costs and operative times of using CT-based, patient-specific, single-use instruments versus conventional metal instruments for TKA. Use of computed tomography (CT)-based three-dimensional (3D) templating and patient-specific cutting guides printed in 3D has shown improved postoperative lower limb alignment parameters. Questions have been raised about the accuracy of conventional TKA instrumentation and planning for an anatomically standard or complex joint. Total knee arthroplasty (TKA) is most frequently planned using conventional two-dimensional weight-bearing lower limb radiographs and is performed with conventional femoral and tibial cutting guides.
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