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

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...

AI Technical Summary

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 this method can only measure the pressure and contact at a specific location, and cannot dynamically track the relative motion of the articular surface

Therefore, there is currently a lack of methods that can dynamically measure and track the movement of articular surfaces

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