Cylinder fitting based lower limb tibia mechanical axis determination method

A technology of mechanical axis and determination method, which is applied in the medical field, can solve the problems of poor determination accuracy and low determination accuracy of the biological force line of the lower limbs, and achieve the effect of high precision and reliable positioning

Inactive Publication Date: 2019-03-26
BEIJING HURWA ROBOT TECH CO LTD
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Problems solved by technology

[0004] The present application provides a method for determining the mechanical axis of the tibia of the lower limb based on cylindrical fitting to solve the problem of l

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  • Cylinder fitting based lower limb tibia mechanical axis determination method
  • Cylinder fitting based lower limb tibia mechanical axis determination method
  • Cylinder fitting based lower limb tibia mechanical axis determination method

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[0037] Computer Aided Orthopedic Surgery (also known as CAOS) uses a navigator to track the position of the end effector under the guidance of medical images, such as CT, MRI, X-ray or three-dimensional ultrasound, and connect the virtual end effector to The surgical site is fused and displayed on the screen, thereby increasing the visibility of the above-mentioned operation, helping doctors avoid important organs and tissues, improving the accuracy of the operation, and reducing intraoperative trauma. Clinical comparative tests show that this operation method using navigator can greatly improve the accuracy of the operation and reduce the deviation rate of orthopedic surgery. Surgery planning is an important part of CAOS, and for TKA surgery planning, the force line of the lower limbs is an important reference for surgery planning. Therefore, the present application provides a method for determining the mechanical axis of the lower limb tibia based on cylindrical fitting to so...

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Abstract

The invention discloses a cylinder fitting based lower limb tibia mechanical axis determination method. The method includes: acquiring a tibia three-dimensional image; fitting the tibia three-dimensional image to obtain a fitted cylinder; acquiring a center line of the fitted cylinder; acquiring a protuberance point at the upper end of tibia; and translating the center line of the fitted cylinderto make it pass through the protuberance point at the upper end of tibia, thus obtaining the lower limb tibia mechanical axis. The method provided by the invention acquires three-dimensional CT tomographic data, fits out the cylinder most similar to the tibial marrow cavity, and then acquires the center line of the cylinder, i.e. a straight line parallel to the mechanical axis of tibia, and then translates the center line to obtain the position of the mechanical axis of tibia, so that the mechanical axis of tibia can be obtained without acquiring the center of ankle joint, and the problems ofpositioning deviation and low positioning accuracy caused by human determination of the center of ankle joint, and by means of image recognition algorithm, a three-dimensional model of the tibial marrow cavity can be worked out automatically, so that the precision can be higher and the positioning is more reliable.

Description

technical field [0001] The present application relates to the field of medical technology, in particular to a method for determining the mechanical axis of the lower limb tibia based on cylindrical fitting. Background technique [0002] Total knee arthroplasty (Total Knee Arthroplasty, hereinafter referred to as TKA) is a technology for the treatment of knee joint diseases, which can effectively eradicate 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 balance and stability of soft tissues such as ligaments, and the position and angle of prosthesis placement. 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 balan...

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Application Information

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IPC IPC(8): A61B34/10A61B90/00G06T17/00
CPCA61B34/10A61B90/06A61B2034/105G06T17/00
Inventor 张晓峰
Owner BEIJING HURWA ROBOT TECH CO LTD
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