Hip bone registration method used in hip replacement surgery

Abstract

The invention relates to a hip bone registration method for hip replacement surgery, which comprises the following steps: S100, preoperative planning: segmenting and reconstructing a CT (Computed Tomography) image of a patient to obtain a three-dimensional model of a hip joint on the surgery side of the patient, and planning a coarse registration point selection scheme and a fine registration point selection scheme through the three-dimensional model of the hip joint; s200, performing coarse registration in an operation: according to a navigation camera, a reflective array and an operation probe, performing registration on a hip joint entity and a three-dimensional model reconstructed during preoperative planning to obtain a coarse conversion relation between a hip bone reference frame and the three-dimensional model; s300, carrying out precise registration point selection of preoperative planning, and carrying out point cloud registration after collection; and S400, a registration result with higher precision is obtained through a point cloud registration algorithm, and finally precise registration of the hip joint entity and the preoperative three-dimensional model is achieved. According to the method, the problem that a traditional registration method is prone to falling into a local optimal solution when the hip joint entity is registered is solved, the situation that errors generated after the acetabular fossa rotates along the acetabular edge cannot be recognized is avoided, and the robustness and precision of registration of the hip joint entity are improved.

Description

technical field [0001] The invention relates to the technical field of three-dimensional medical image rigid registration, in particular to a hip bone registration method used in hip joint replacement surgery. Background technique [0002] The 3D model is reconstructed according to the CT image data before operation, and the pelvic reference point after the patient's anatomy is obtained through the surgical probe during the operation, and the reference point is rigidly registered with the 3D model, and the hip joint entity is compared with the 3D model planned before operation. The model matches. Most rigid registration algorithms use a combination of coarse registration and fine registration. Coarse registration refers to the calibration of three structural feature points in the 3D model in the preoperative planning plan. During the operation, the doctor refers to the planned points to collect them, and obtains a rough spatial transformation relationship between the two th...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a hip bone registration method used in hip joint replacement surgery, which solves the problem that it is easy to fall into the local optimal solution when using the traditional registration method to register the hip joint entity, and avoids After the socket is rotated along the socket, the error cannot be identified, which improves the robustness and accuracy of the registration of the hip joint entity

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