Preoperative planning

For preoperative planning, standard CT of the hip, knee, and ankle regions was acquired prior to the surgery, according to the manufacturer’s protocol. The axial CT images were exported to a CD in DICOM file format, segmented, and stored to a dedicated laptop, with a proprietary operating system. A 3D model of the patient's femur, tibia, and fibula was generated from segmented CT images and anatomical bone landmarks selected for each bone to establish a local reference system. These images were then registered to the robotic system to create a virtual operative plan. Achieving a neutral mechanical axis of the lower limb was the target implant position, with the required planned bone resections and implant size needed predicted using the RA-TKA system. These preoperative renderings were used by the robotic system to map an intraoperative plan, including the location of the tibial and femoral cuts and, based on this information, the tibial and femoral implant component sizes to be used. (Fig. 1).

Computer images of planning for robot-assisted total knee arthroplasty with three-dimensionally reconstructed tibial and femoral component sizes 股骨型号, size of femoral implant; 胫骨托型号, size of tibial plateau; 胫骨垫厚度, Tibial cushion thickness; 软骨厚度, cartilage thickness; 外翻, valgus; 外旋, external rotation; 伸直, extension; 外, lateral; 内, medial