Effects of loading rate, age, and morphology on the material properties of human rib trabecular bone

Albert, Devon L.; Katzenberger, Michael J.; Hunter, Randee L.; Agnew, Amanda M.; Kemper, Andrew R.

doi:10.1016/j.jbiomech.2023.111670

Cited by 3 publications

(2 citation statements)

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“…In this study, cortical bone was investigated due to the structural relevance of the cortical bone being higher than that of the trabecular bone ( 29 – 31 ). It is acknowledged that trabecular bone properties and aging effects ( 6 ) can also contribute to rib response and will be investigated in future studies. Similarly, cortical bone thickness was not altered in the present study.…”

Section: Discussionmentioning

confidence: 99%

“…The thoracic cage load bearing tissues are the ribs, costal cartilage and sternum. It has been suggested that changes in material properties and geometry with increasing age may potentially contribute to the increased incidence of thorax injury and morbidity in the older adult population ( 6 – 8 ). Particular to the ribs, the cortical material properties have been measured in coupon tension testing ( 8 ).…”

Section: Introductionmentioning

confidence: 99%

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Explaining and predicting the increased thorax injury in aged females: age and subject-specific thorax geometry coupled with improved bone constitutive models and age-specific material properties evaluated in side impact conditions

Corrales,

Bolte,

Pipkorn

et al. 2024

Front. Public Health

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Predicting and understanding thorax injury is fundamental for the assessment and development of safety systems to mitigate injury risk to the increasing and vulnerable aged population. While computational human models have contributed to the understanding of injury biomechanics, contemporary human body models have struggled to predict rib fractures and explain the increased incidence of injury in the aged population. The present study enhanced young and aged human body models (HBMs) by integrating a biofidelic cortical bone constitutive model and population-based bone material properties. The HBMs were evaluated using side impact sled tests assessed using chest compression and number of rib fractures. The increase in thoracic kyphosis and the associated change in rib angle with increasing age, led to increased rib torsional moment increasing the rib shear stress. Coupled with and improved cortical bone constitutive model and aged material properties, the higher resulting shear stress led to an increased number of rib fractures in the aged model. The importance of shear stress resulting from torsional load was further investigated using an isolated rib model. In contrast, HBM chest compression, a common thorax injury-associated metric, was insensitive to the aging factors studied. This study proposes an explanation for the increased incidence of thorax injury with increasing age reported in epidemiological data, and provides an enhanced understanding of human rib mechanics that will benefit assessment and design of future safety systems.

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Section: Discussionmentioning

confidence: 99%