A Cadaveric Comparative Study on the Surgical Accuracy of Freehand, Computer Navigation, and Patient-Specific Instruments in Joint-Preserving Bone Tumor Resections

Figure 5

Definition of the kerf and location accuracy. The thick grey line shows the kerf, which is the bone loss that arises during an osteotomy. The saw is aligned on the target plane (black), a thin line in the middle of the kerf. The blue line defines the achieved plane of the performed resections. Location accuracy is the maximum distance (mm) between the target (black line) and achieved (blue line) planes. When the measured error or difference was on the tumor side, the error was corrected minus the kerf; when the measured error was on the healthy side, the error was corrected plus the kerf.