A femur or tibia registration method and device based on total knee replacement surgery

Abstract

The invention discloses a femoral or tibial registration method and device based on total knee replacement surgery. The method comprises the steps of acquiring data point pairs, wherein the data pointpairs include a CT data reconstructed femoral or tibial digital three-dimensional model and selected feature points corresponding to bone points; adopting a point pair registration algorithm for performing rough registration on the data point pairs to obtain rough registration results; acquiring data point cloud pairs, wherein the data point cloud pairs include the CT data reconstructed femoral or tibial digital three-dimensional model and slidably collected point clouds corresponding to bones; performing precise registration according to the rough registration results and the data point clouds. According to the method and the device, anatomical feature points which are clear for a doctor are adopted for carrying out a rough registration algorithm, and dense three-dimensional point cloudstereoscopic data is further utilized to perform a fine registration algorithm, so that the registration accuracy rate is greatly increased. The first registration result based on SVD-ICP is used as the initial position of the next ICP registration, and the point cloud data is collected again to achieve a better registration effect from a more satisfactory initial position.

Description

technical field [0001] The present application relates to the technical field of total knee replacement surgery, in particular to a femur or tibia registration method and device based on total knee replacement surgery. Background technique [0002] Artificial total knee replacement is a technique for treating knee joint diseases. It can effectively treat severe knee joint pain and greatly improve the quality of life of patients. The main influencing factors of artificial joint replacement surgery include accurate osteotomy in three-dimensional space, the position and angle of prosthesis placement, and total knee joint replacement has particularly strict requirements on these factors. Traditional surgery uses a mechanical guide to perform intramedullary and extramedullary positioning, and the operator judges the osteotomy, prosthetic position, and soft tissue balance with the naked eye, feel, and experience. Many subjective factors directly affect the accuracy of the operatio...

AI Technical Summary

Problems solved by technology

[0004] The purpose of this application is to provide a femoral or tibial registration method and device based on total knee replacement surgery to solve the problem of low accuracy of the knee joint registration method

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