Pelvis/Sacrum Fracture Tolerance for Males and Females under High-Rate Loading

Authors: David M. Boyle, Warren N. Hardy—Virginia Tech, Center for Injury Biomechanics; Kerry A. Danelson—Wake Forest, Center for Injury Biomechanics

Abstract

Pelvis fracture tolerance was determined for three groups: small females (5F), large females (75F), and midsized males (50M) under highly controlled, repeatable, and high-rate conditions that mimic an underbody blast event experienced by a mounted soldier. Thirteen fresh-frozen post-mortem human surrogates (PMHS) pelvis specimens were tested using a cam-driven impact device. High-speed x-ray video (2,000 fps) was used to determine fracture timing. Average 50M fracture loads (10,196 +/- 3,081 N) were greater than 75F loads (9,367 +/- 2,501 N) and 5F loads (9,575 +/- 3,234 N), which were roughly the same. ANOVA tests did not show that fracture loads were significantly different between anthropometries (One-way: p = 0.9287). Student’s t tests did not show a significant difference in fracture loads between any two anthropometries. These results contrast with results from lumbar spine (Pietsch et al., 2024) and ankle (Hardy et al., 2024) tests conducted using the same setup which found statistically significant different fracture loads between anthropometries. This bears further investigation.

Type: Short Communication

© Stapp Association, 2024

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