US 12,303,205 B2
TKA intraoperative planning adjustment method, apparatus and device for TKA
Ziang Xu, Beijing (CN); Zhan Wang, Beijing (CN); and Zongxiang Liu, Beijing (CN)
Assigned to TINAVI MEDICAL TECHNOLOGIES CO., LTD, Beijing (CN)
Appl. No. 17/287,438
Filed by TINAVI MEDICAL TECHNOLOGIES CO., LTD, Beijing (CN)
PCT Filed Nov. 16, 2020, PCT No. PCT/CN2020/129136
§ 371(c)(1), (2) Date Apr. 21, 2021,
PCT Pub. No. WO2021/147489, PCT Pub. Date Jul. 29, 2021.
Claims priority of application No. 202010072017.3 (CN), filed on Jan. 21, 2020.
Prior Publication US 2022/0175452 A1, Jun. 9, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. A61B 34/10 (2016.01); A61B 34/20 (2016.01)
CPC A61B 34/10 (2016.02) [A61B 2034/102 (2016.02); A61B 2034/104 (2016.02); A61B 2034/105 (2016.02); A61B 2034/108 (2016.02); A61B 2034/2055 (2016.02)] 13 Claims
 
1. An intraoperative planning adjustment method for Total Knee Arthroplasty (TKA) via a computer-aided system, comprising:
importing, by the computer-aided system, preoperative planning data;
performing, by the computer-aided system, image registration of preoperative planning images with the surface contour of a knee joint of a surgical subject;
acquiring, by the computer-aided system, the dynamic spacing force line data of the knee joint at a continuous flexion-extension angle, comprising:
setting a plurality of tracers on the femur and tibia of the knee joint;
acquiring, by the computer-aided system, the motion trajectory information of the knee joint during the continuous flexion-extension of a lower limb by continuously tracking the plurality of tracers via an optical camera;
calculating, by the computer-aided system, the gap and force line angle of the lower limb at a continuous flexion-extension angle;
wherein the gap and force line angle comprise:
a first gap, being a minimum gap between the outer surface of the medial femoral condyle of the prosthesis and the tibial osteotomy plane;
a second gap, being a minimum gap between the outer surface of the lateral femoral condyle of the prosthesis and the tibial osteotomy plane; and
a force line angle, being an angle between a femoral mechanical axis and a tibial mechanical axis;
visually displaying, by the computer-aided system, the dynamic spacing force line data as a graph; wherein the graph for the dynamic spacing force line data comprises:
a first gap curve, a continuous curve drawn by taking the flexion-extension angle of the lower limb as an ordinate and the first gap as a first abscissa;
a second gap curve, a continuous curve drawn by taking the flexion-extension angle of the lower limb as an ordinate and the second gap as a first abscissa; and
a force line angle change curve, drawn by taking the flexion-extension angle of the lower limb as an ordinate and the force line angle as an abscissa;
adjusting, by the computer-aided system, prosthesis planning according to the visual display of the dynamic spacing force line data.