Individualized osteotomy guide set and its design method

Abstract

The invention discloses an individualized bone cutting guide plate suite and a design method thereof. The individualized bone cutting guide plate suite comprises an individualized knee joint tibia near end bone cutting guide plate, an individualized knee joint femur far end bone cutting guide plate and an individualized femur multi-surface bone cutting suite. By adopting individualized design, removing influences of articular cartilages and adopting a flexion gap balance technology, bones can be cut more accurately, and a surgeon can be effectively assisted to improve the quality and efficiency of osteotomy.

Description

technical field [0001] The invention relates to a set of individualized osteotomy guide plate kits and a design method thereof. Background technique [0002] The knee osteotomy guide is used for the osteotomy process in total knee arthroplasty. The traditional guides are all non-individualized, which more or less do not meet the needs of patients. The relatively new 3D printing individualized knee osteotomy The bone guide plate has been improved in this regard. It is designed and manufactured based on medical imaging data, and simulates the operation and formulates the operation plan before the operation. During the operation, the precise osteotomy is performed according to the preoperative plan. [0003] The existing 3D printed individualized knee osteotomy guides have some shortcomings in the processing of articular cartilage factors. MR data cannot accurately extract cartilage modeling, especially when cartilage degeneration occurs, and the registration and fusion of CT a...

AI Technical Summary

Problems solved by technology

[0003] The existing 3D printed individualized knee osteotomy guides have some shortcomings in the processing of articular cartilage factors. MR data cannot accurately extract cartilage modeling, especially when cartilage degeneration occurs, and the registration and fusion of CT and MR data is also difficult. It will cause errors and troubles, so that the thickness of the articular cartilage cannot be accurately estimated during the design of the guide plate, thus affecting the accuracy of the osteotomy. Although some guide plates can estimate the thickness of the cartilage, removing the cartilage during the actual operation will increase the operation time and be inaccurate. In addition, all current 3D printed individualized knee osteotomy guides cannot complete the entire osteotomy process for the uneven development of the femoral condyle, malunion of old fractures of the knee, tibia, and femur, and large bone defects. There is a guide plate that does not take into account the soft tissue balance around the knee joint and the flexion-extension gap is rectangular; in addition, the imported guide plate is expensive and takes a long time to produce and transport. Therefore, the existing guide plate needs to be improved

[0004] At present, the common method of making the knee osteotomy guide plate is mainly to extract the lower limb bones and knee articular cartilage according to CT and MRI data, and then determine the biomechanical markers such as the mechanical axis, line of force, condylar axis, and intercondylar notch of the lower limbs. Combined with the data of the knee prosthesis to be replaced, CAD design is performed to determine the osteotomy plane and femoral external rotation angle. The guide groove of the guide plate is the actual osteotomy plane required, which cannot be changed at will, and the overall shape of the guide plate is not constant. No matter how it changes, it always revolves around "accurate in-position fixation, and the guide groove of the guide plate is consistent with the design to improve the accuracy of osteotomy". Fixing the guide plate too tightly will cause obvious deformation, and it is necessary to plan the articular surface cartilage during the operation, which is inconvenient and inaccurate, but reduces the accuracy of the osteotomy, and does not consider the balance of the flexion and extension gap and the trajectory of the patella, so that High incidence of postoperative anterior patellar pain

Images