Articular surface movement follow-up measurement method based on virtual mark point

A technology of tracking measurement and measurement method, which is applied in the field of advanced medical equipment and sports biomechanics research, and can solve the problem of inability to dynamically track the relative motion of joint surfaces.

Inactive Publication Date: 2009-04-01
TSINGHUA UNIV
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Problems solved by technology

In biomechanical research, people try to use a film force sensor to measure the contact and force of the articular surface in motion, and indirectly study the relative motion of the joint (such as "A NewDynamic Contact Pressure Sensor for In- Vitro Knee Joint"), but th

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  • Articular surface movement follow-up measurement method based on virtual mark point
  • Articular surface movement follow-up measurement method based on virtual mark point
  • Articular surface movement follow-up measurement method based on virtual mark point

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Embodiment Construction

[0044] The present invention mainly comprises following steps flow process:

[0045] Step 1, fix the traceable marker frame on the femur and the tibia respectively, so as to determine the coordinate system of the femur and the coordinate system of the tibia.

[0046] Step 2, establishing virtual landmarks on the articular surfaces of each bone. The method is to touch the articular surface with a three-dimensional measuring probe. The positions of a series of virtual landmark points on the femoral articular surface and the tibial articular surface in the femoral coordinate system and the tibial coordinate system are respectively obtained.

[0047] Step 3, through the high-precision optical motion tracking device, according to a certain sampling rate, track and measure the space coordinates and rotation direction of the trackable sign frame fixed on each bone, so as to track the position of each bone (rigid body) in the global coordinate system Three-dimensional space movement...

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Abstract

A method for tracking and measuring an articular surface movement based on virtual signalized points belongs to the technical field of the knee joint replacement. The method is characterized in that a series of virtual signalized points are respectively defined on the joint surfaces of a thighbone and a tibia which relatively move in advance; the coordinate transformation relation between the virtual signalized points and a trackable sign gantry which is fixed on the skeleton is established; the orbit tracking and measuring is carried out on the trackable sign pantry by optical three-dimensional motion measuring equipment; and the motion trail of all virtual sign points is obtained by the coordinate transformation, thus realizing the tracking and measuring on the relative movement of the joint surface which is represented by the virtual signalized points. The method accurately reflects the relative movement of the joint surface and provides quantified information for joint replacement and joint movement analyzing in clinical practice.

Description

technical field [0001] The invention designs a method for determining the relative position and motion of the joint surface in the knee joint through virtual marker points, and belongs to the advanced medical equipment of computer-aided surgery and the research field of sports biomechanics. Background technique [0002] In the past 10 years, the clinical application of artificial joints has become more and more common, and various types of joints have been continuously introduced to the medical market. In joint replacement surgery, it is the core of the new artificial joint design to correctly install the artificial joint prosthesis, make the joint movement conform to the law of human physiological movement, and optimize the contact and friction of the relative movement between the joint parts. At the same time, in the research of human sports science and sports biomechanics, the understanding of relative motion and contact between human articular surfaces is the basis for r...

Claims

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Application Information

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IPC IPC(8): A61B5/11
Inventor 王广志丁辉朱忠林刘文博
Owner TSINGHUA UNIV
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