Figures & data
Figure 1. Preoperatively, the mechanical axis deviation, femoral coronal angle, tibial coronal angle, femoral sagittal angle, and tibial sagittal angle were measured by 3-dimensional CT scanning.
Figure 2. Rotational alignment of the femoral component was measured postoperatively using a transverse section of the CT scan.
Figure 3. To obtain a 3D image, the whole leg was scanned from the femoral head through the knee joint to the ankle joint. However, preoperative planning with ORTHODOC requires only three volumes: the femoral head (A), the knee joint (B), and the ankle joint (C).
Figure 4. Transferring the CT data to ORTHODOC, the surgeon selected the type and size of component and the polyethylene from the menus and positioned them freely via mouse control with the ORTHODOC software.
Figure 5. Robot-assisted TKA. The knee was flexed and rigidly fixed by two Schanz screws, fixation frames, connecting rods, pin-to-rod clamps, rod-to-rod clamps and Hoffmann adapter rods.
Figure 6. The robot milled the femoral volumes with a high-speed milling tool attached to its arm. Better surface quality of femoral or tibial bone cuts can be achieved using high-speed milling cutters attached to robotic arms than with oscillating saws.
