Biomechanical Response of the Human Clavicle: The Effects of Loading Direction on Bending Properties

• Autores: Andrew R. Kemper, Joel D. Stitzel, Craig McNally
• Localización: Journal of applied biomechanics, ISSN-e 1543-2688, ISSN 1065-8483, Vol. 25, Nº. 2, 2009, págs. 165-174
• Idioma: inglés
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• Resumen

  • The purpose of this study was to determine the influence of loading direction on the structural response of the human clavicle subjected to three-point bending. A total of 20 clavicles were obtained from 10 unembalmed fresh-fro­zen postmortem human subjects ranging from 45 to 92 years of age. The right and left clavi­cles from each subject were randomly divided into two test groups. One group was impacted at 0° from the transverse plane, and the second group was impacted at 45° angle from the transverse plane. There was no statistically sig­nificant difference in peak force (p = .22), peak moment (p = .30), or peak displacement (p = .44) between specimens impacted at 0° versus 45° from the transverse plane. However, there was a significant difference in the structural stiffness (p = .01) and peak strain (p < .01) between specimens impacted at 0° versus 45° from the transverse plane. The peak strain, however, must be evaluated with caution because of the variation in fracture location relative to the strain gauge. Due to the con­trolled matched data set, the differences in the structural stiffness with respect to loading direction can be attributed to the complex geometry of the clavicle and not material dif­ferences.