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A Multi-Body Optical Measurement System for the Study of Human Joint Motion


 Human joint systems exhibit complex, coupled movement patterns. Various measurement devices have been developed to study human joint behavior. They include electromechanical, electromagnetic, and electro-optical systems; and radiographic techniques [Lim et al., 1997; Milne et al., 1996; Moeini et al., 1996]. When measuring global joint motion, accuracy of the system must be considered. Measures of “relative” joint motion depend on system resolution and repeatability. An improved three-dimensional (3-D) non-contact measurement system was develop to study human joint motion. System calibration for two-dimensional (2-D) analysis was performed. Application to the cervical spine is presented.