Three-dimensional analysis of accuracy of component positioning in total knee arthroplasty with patient specific and conventional instruments: A randomized controlled trial

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52 patients scheduled for total knee arthroplasty were randomized to have the procedure completed using patient-specific instrumentation or conventional intramedullary and extramedullary instruments. Patients were assessed postoperatively on CT for deviation from the planned component orientation in the coronal, sagittal, and axial planes. Results demonstrated a significantly smaller deviation in coronal femoral component position in the PSI group compared to the conventional group, but also a significantly higher deviation in tibial component slope.