United States Department of Transportation
i
Lower Leg Biofidelity Corridors for Heel Impact
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2019-05-01
[PDF-2.95 MB]
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Abstract:This report describes the methodology and results of development of biofidelity response corridors based on data for axial loading through the heel of 12 small female post mortem human surrogates (PMHS) lower extremities, and 2 additional small female PMHS. These biofidelity response corridors were based on anticipated measurement capabilities of typical ATDs, and include metrics such as internal tibia and fibula axial load, external footplate axial load, knee axial load, and footplate displacement. Methodologies include initial data treatment, development of coordinate systems, transformation of internal load cell measurements from PMHS to an anatomic coordinate system analogous to a 5th percentile female ATD, load cell compensation for the footplate load cell, scaling techniques, data inclusion analysis, and corridor development techniques. An initial examination was performed for the footplate displacement and all axial force traces using the ISO rating method to determine if any individual trace was an outlier, or if there was a systematic difference between the shod condition and the barefoot condition. The combined dataset corridors are based on 12 tests, shod corridors are based on 7 tests, and barefoot corridors are based on 5 tests. For time-history corridors, footplate axial displacement, footplate load cell forces (raw and mass compensated), total cross sectional axial force from the tibia and fibula load cells, tibia load cell axial force, fibula load cell axial force, and knee axial load are reported. For cross plotted footplate displacement corridors, mass-compensated footplate axial load, total cross sectional axial force from the tibia and fibula load cells, tibia load cell axial force, fibula load cell axial force, and knee axial load are reported. A scaling analysis was also performed, and found leg length to be a better metric for scaling than total height. The same time-history and cross plotted footplate displacement corridors were developed with leg length based scaled data. Overall, it was found that the shod corridors developed were narrower than either the combined dataset corridors or the barefoot corridors. Additionally, corridors developed with data scaled by leg-length were narrower than those developed using unscaled data. Shod, scaled corridors are recommended for use in 5th female ATD biofidelity evaluations.
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Content Notes:Forman, J. L., Crandall, J. R., & Roberts, C. W. (2019, May). Lower leg biofidelity corridors for heel impact (Report No. DOT HS 812 641). Washington, DC: National Highway Traffic Safety Administration. This report replaces a previously published version.
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