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KMID : 0613820080180111532
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Journal of Life Science
2008 Volume.18 No. 11 p.1532 ~ p.1537
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Biomechanical and Physiological Comparative Analysis of the Single-Radius Knee Arthroplasty Systems and Multi-Radius Knee Arthroplasty Systems
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Jin Young-Wan
Kwak Yi-Sub
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Abstract
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The purpose of this study was to investigate the effect of different arthroplasty designs on knee kinematic and lower limb muscular activation for up-stair and down-stair movement. 3-D video analysis of whole body and joint kinematics and EMG analysis of quadriceps and hamstrings were conducted. One-way ANOVAs were used for statistical analyses (p=0.05). The single-radius group exhibited more arthroplasty limb quadriceps EMG and hamstring coactivation EMG than the multi-radius group. Single-radius demonstrated more abduction angular displacement and reached peak abduction earlier than the multi-radius arthroplasty limb. The single-radius the percent body fat showed similar values in the Elderly, Single and Multi-radius group among the periods, however Control group was Lowered among the periods. Single-radius group limb also increased the quadriceps muscle activation level to produce more knee extension moment to compensate for the short quadriceps moment arm. Resting metabolic rate was significantly increased in control group in the period of LI. Energy expenditure was extremely increased in all groups except control group among the periods. We can say this is the exercise effects.
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KEYWORD
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Single-radius, multi-radius, kinematic, moment, EMG, %body fat, energy expenditure, metabolic rate
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