Summary

Our overall findings of our customized jigs study suggest that it should not invariably be relied upon and that we should constantly be geared up for surprises intraoperatively.

Abstract

Total knee arthroplasty (TKA) using patient specific instruments (PSI) is becoming popular.. Most of the current studies in the literature focuses on the overall postoperative coronal alignment following PSI TKA. The determination of the proper component sizing in PSI is a major factor affecting the final surgical outcome. In the conventional method of TKA preoperative templating is done to determine the size of the component. However studies of template based sizing in TKA shows variations in the size predicted and the sizes used. Literature does not give much evidence regarding the accuracy of the size of the pre-calculated jigs used in PSI even though there have been studies showing the overall advantage of the former over the conventional methods. The PSI software generated preoperative plan is one of the most important steps in the PSI technology. The PSI technique (Preplan TM, Stryker) was used in all the cases for TKAs, in this study. The aim of the study was to correlate the size of the prosthesis that is predicted based on the pre-Computerized Tomography (CT) scan analysis for PSI matches to that being used Intraoperatively by the surgeon. This article outlines the accuracy and the clinical evidence about the size of the jigs used in these.