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Measurement system for human joint range of motion
Author(s): 
Pages: 34-38
Year: Issue:  1
Journal: Chinese Journal of Medical Physics

Keyword:  joint range of motionleast-square methodNDI Polaris Spectra;
Abstract: Joint range of motion(ROM) is an important indicator of rehabilitation to determine the physical disability grade and assess the joint rehabilitation. The most common measurement methods are universal protractor, photography and X-ray.However, the accuracy, stability and real-time of these methods are unable to meet the clinical needs. In this paper, an optical positioning equipment named NDI Polaris Spectra was proposed to measure the human ROM, improving the accuracy,repeatability and real-time. Passive balls were firstly fixed on the bone marker points of human body. And NDI Polaris Spectra was applied to track the positions of passive balls. The three- dimensional coordinates of passive balls were inputted into computer by NDI Polaris Spectra. Based on the three-dimensional coordinates, the physical movement and axis were simulated by least-square method to calculate the joint ROM. The measurement accuracy of proposed method reached 0.5°; the standard deviation was no more than 0.02°. The accuracy and stability of the proposed method are better than those of existing methods,meeting the clinical needs.
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