The purpose of this study was to determine if intraoperative navigation predicted final implant position of total knee arthroplasties (TKAs) performed with patient-specific instrumentation (PSI). We retrospectively reviewed 60 TKAs performed with PSI and imageless navigation. These values were compared to postoperative coronal alignment based on long-leg radiographs, as well as rotation and tibial slope based on CT scans. The intraoperative coronal position of the tibia as measured by the intraoperative navigation indicated a significantly higher deviation from the neutral mechanical axis than the actual final position (P= 0.03). Similarly, tibial slope and femoral component rotation measured by intraoperative navigation significantly deviated from the final slope and femoral component rotation (P < 0.0001). In conclusion, intraoperative navigation of PSI position showed a significantly high deviation from the true final implant position. Level of Evidence: Level III, therapeutic. See Instructions to Authors for a complete description of levels of evidence.
- Femoral rotation
- Intraoperative navigation
- Mechanical axis
- Patient-specific instrumentation (PSI)
- Total knee arthroplasty (TKA)
ASJC Scopus subject areas
- Orthopedics and Sports Medicine