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Method for positioning human body knee joint flexible motion axis in lateral femoral condyle long-axis section

A technology of extension and flexion movement and long axis section, applied in the field of physics, can solve problems such as the inability to truly locate the axis of knee joint extension and flexion movement

Inactive Publication Date: 2011-03-30
RENJI HOSPITAL AFFILIATED TO SHANGHAI JIAO TONG UNIV SCHOOL OF MEDICINE +1
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Problems solved by technology

[0006] The object of the present invention is to provide a kind of method that locates the axis center of human knee joint extension and flexion in the long axis section of femoral condyle, described this method of positioning the axis center of human knee joint extension and flexion in the long axis section of femoral condyle To solve the technical problem that the existing technology cannot truly locate the axis of knee joint extension and flexion in a living human body

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  • Method for positioning human body knee joint flexible motion axis in lateral femoral condyle long-axis section
  • Method for positioning human body knee joint flexible motion axis in lateral femoral condyle long-axis section
  • Method for positioning human body knee joint flexible motion axis in lateral femoral condyle long-axis section

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Embodiment Construction

[0027] Taking the left knee joint of a healthy 30-year-old male as an example, the method for locating the axis of extension and flexion of the human knee joint in the long axis section of the femoral condyle is introduced. The steps are as follows:

[0028] 1. Image data collection

[0029] The knee joint is in the extended position for CT scanning to acquire image data. Scanning parameters: continuous tomography, voltage 140.0kV, current 183.0mAs, slice thickness 0.352mm, 512×512 matrix, pixel 0.352mm, field of view (FOV) 18.0cm, such as figure 1 shown.

[0030] 2. Construction of the three-dimensional geometric model of the femoral condyle

[0031] Import the bone structure image data of the CT scan into the Mimics software in .dicom format, and apply the Thresholding module to automatically generate a two-dimensional digital mask of the femoral condyle with the bone gray value threshold range (upper limit 1250, lower limit 2888). In the Edit masks module, perform the gap ...

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Abstract

The invention relates to a method for positioning a human body knee joint flexible motion axis in lateral femoral condyle long-axis section, which comprises the steps of: acquiring image data of a human body knee joint full bone structure by using a CT machine, and constructing a lateral femoral condyle three-dimensional geometrical model by using the image data; then determining a lateral femoral condyle long-axis section and a lateral femoral condyle surface curve; dividing the lateral femoral condyle surface curve into arc sections with equal lengths; calculating positions of centers of circles of the arc sections in the lateral femoral condyle long-axis section; using the positions of the centers of circles as a human knee joint flexible motion axis; and finally, calculating a knee joint instant center curve according to the positions of the centers of circles of all arc sections. The invention realizes the positioning of important kinematics parameters of the knee joint according to the kinematics characteristics of determining the knee joint flexible motion axis by the lateral femoral condyle dissection shape, and has practical values on researching the human body individualized knee joint kinematics, the knee joint prosthesis design and the knee joint motion stimulation, and important significance for the diagnosis and the prognosis evaluation of knee joint diseases.

Description

Technical field: [0001] The present invention relates to the field of physics, in particular to measurement technology, in particular to a method for measuring the axis of extension and flexion of the human knee joint and the instantaneous center curve, in particular to a method for locating the axis of extension and flexion of the human knee in the long axis section of the femoral condyle Methods. Background technique: [0002] The knee joint is one of the most complex joints in the human body, with special kinematics. During the movement of the knee joint from extension to flexion, the position of the axis of rotation is not constant, and the inner part of the femoral condyle of the knee joint is gradually moved backward. Connecting all the axes of rotation during the extension and flexion of the knee joint, it appears as a "J"-shaped curve on the sagittal section of the femoral condyle of the knee joint, called the instantaneous center curve. [0003] In theory, the axi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/11
Inventor 徐卿荣董英海董跃福胡广洪张华张宝亮范秦寅
Owner RENJI HOSPITAL AFFILIATED TO SHANGHAI JIAO TONG UNIV SCHOOL OF MEDICINE
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