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In this paper, stress distribution in patella was studies by 3-D photoelastic experiments and finite element calculations. The experimental conditions were in good agreement with that of body mechanics: (1) The ratios of m. quadrieeps femoris force FQ to lig. patella force FP were 1.03-1.42. (2) The angles between FQ and FP were 8.4 ° -18.7 °. (3) The ratio of modulus of elasticity for epoxy resin and silicone rubber matched that for patella and cartilage, i.e., 145:1. The principal stresses and their path line, normal stresses, contact stresses between patella and ossis femoris were determined in various flexion angles (15 °, 30 °, 45 °, 60 °, 75 °, 90 °). Two of the correlations were: (1) Maximum principal stress in the front of patella (equation presented) (2) Maximum contact stress between patella and ossis femoris (equation presented) where W was body weight subjected by a single foot. It was proved that the transverse break of patella resulted from the case that the principal stress in the front of patella exceeded ultimate tensile strength. And Tension Band Wiring (TBW) therapy conformed to the law of physiological stress field. A modified K-needles position in TBW therapy was suggested. These results are useful for further research of human patella mechanics and recovery therapy. No similar result has been found in American MED LIN Data Bank. © 1991 SPIE. All rights reserved.
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ISSN: 0277-786X
Year: 1991
Volume: 1554
Page: 407-417
Language: English
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ESI Highly Cited Papers on the List: 0 Unfold All
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30 Days PV: 5
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