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The Effect of Tibial Curvature and Fibular Loading on the Tibia Index

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The tibia index (TI) is commonly used to predict leg injury based on measurements taken by an anthropomorphic test device (ATD). The TI consists of an interaction formula that combines axial loading and bending plus a supplemental compressive force criterion. Current ATD lower limbs lack geometric biofidelity with regard to tibial curvature and fibular load-sharing. Due to differences in tibial curvature, the midshaft moments induced by axial loading are different in humans and ATDs. Midshaft tibial loading in the human is also reduced by load-sharing through the fibula, which is not replicated in current ATDs. In this study, tibial curvature and fibular load-sharing are quantified through CT imaging and biomechanical testing, and equations are presented to correct ATD measurements to reflect the loading that would be experienced by a human tibia.
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Keywords: Biofidelity; Biomechanics; Dummies; Injury Criteria; Lower Extremity; Tibia Index

Document Type: Research Article

Affiliations: 1: Biodynamic Research Corporation, San Antonio, Texas, USA 2: University of Virginia Center for Applied Biomechanics, Charlottesville, Virginia, USA

Publication date: June 1, 2004

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