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Clinical Mechanics Group, Queen's University, Kingston, Ontario, Canada.
A semiautomatic three-dimensional knee motion assessment system has been developed based on an optoelectric motion tracking system connected to an IBM-compatible computer. Critical decisions made in implementing the software component of the system include the modelling of the thigh and lower leg segments, calculating the knee angles, reaction forces, and moments; the file structure used and the format of the programs used to process the data are outlined. Once the subject-specific data have been collected, the system of programs requires no other user-intervention during processing. Also, selected curve parameters are automatically extracted from the output and combined with the subject-specific data that include precision X-ray and anthropometric data, which are all added to a knee motion assessment database. The automated portion of the system frees the experimenter from data processing and allows concentration on data analysis.
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