Abstract
Relationships between the micro-architecture description of cancellous bone, obtained from medical imaging, and its mechanical properties can be used to assess the compression fracture risk at high and low strain rate. This study extends the rupture prediction to the intermediate strain rate regime. The micro-architecture description was obtained with a CT-scan, for which geometry, topology, connectivity and anisotropy parameters were computed and compared to mechanical identified parameters in order to confirm their usefulness. Three strain rates were investigated: 1/s, 10/s and 100/s using two different devices: a Wedge-Bar apparatus and a conventional split Hopkinson pressure bar implemented with a Cone-in-Tube striker and a tandem momentum trap. This setup provides a constant strain rate loading with routine specimen recovery allowing the fracture zone to be investigated. This study reveals that a transition in the response behaviour occurred in the intermediate regime and confirms the significant porous organization influence through the regimes.
Highlights
MethodsHuman musculoskeletal modeling requires accurate knowledge of bone failure response including cancellous bone fracture
Detailed features of the micro-architecture of porous cancellous bone [6] have been linked to the quasi-static behaviour, to the dynamic and confined dynamic loading [7] to predict the fracture localization [8], the micro-damage [9] and the global mechanical response [10]
The magnitude of the observed variations is consistent with previously published data on bovine cancellous bone [15]
Summary
Human musculoskeletal modeling requires accurate knowledge of bone failure response including cancellous bone fracture. Bovine bone specimens were compressed up to the point of trabeculae collapse, at 3 strain rates in the ISR regime (1/s to 100/s) using two different devices: a Wedge-Bar apparatus [11, 12] and a conventional split Hopkinson pressure bar (SHPB) implemented with a Cone-in-Tube (CiT) striker [12] and a tandem momentum trap [13]. Both testing techniques allow for specimen recovery after a single loading event. The aim of this study is to quantify the links between cancellous architectural descriptors and macroscopic mechanical behaviour including fracture initiation under ISR compression loading
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