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The Effects of Trabecular-Bone Loading Variables on the Surface Signaling Potential for Bone Remodeling and Adaptation

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Abstract

It is widely believed that mechanical forces affect trabecular bone structure and orientation. The cellular mechanisms involved in this relationship, however, are poorly understood. In earlier work we developed a theoretical, computational framework, coupling bone-cell metabolic expressions to the local mechanical effects of external bone loading. This theory is based on the assumption that osteocytes within the bone tissue control the recruitment of bone-resorbing osteoclasts and bone-forming osteoblasts, by sending strain-energy-density (SED) related signals to trabecular surfaces through the osteocytic, canalicular network. The theory explains the known morphological effects of external bone-loading variations in magnitude and frequency. It also explains the development of osteoporosis, as an effect of increased osteoclast resorption due to estrogen deficiency in postmenopausal women, and to reduced physical activity levels in general. However, the theory uses lumped variables to represent the mechanisms of osteocyte mechano-sensing and signaling. The question is whether these mechanisms could not be specified in a more realistic way. On the one hand, anabolic osteocyte signals might be triggered by the local mechanical loading variables they experience directly, as we assumed in our original theory. On the other hand, osteocyte signals might be triggered by fluid flow in the osteocytic network at large, as was suggested by others. For that purpose we compared the effects of SED, maximal principal strain and volumetric strain as representing local loading variables, to their spatial gradients on the morphological predictions of our computational model. We found that, in concept, they all produced reasonable trabecular structures. However, the predicted trabecular morphologies based on SED as the triggering variable were more realistic in dimensions and relevant metabolic parameters.

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Authors and Affiliations

  1. Department of Biomedical Engineering, Eindhoven University of Technology, The Netherlands

    R. Ruimerman, B. van Rietbergen, P. Hilbers & R. Huiskes

  2. Eindhoven University of Technology, Biomedical Engineering, Materials Technology, PO Box 513, WH 4.131, 5600 MB Eindhoven, The Netherlands

    R. Huiskes

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  1. R. Ruimerman
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Ruimerman, R., van Rietbergen, B., Hilbers, P. et al. The Effects of Trabecular-Bone Loading Variables on the Surface Signaling Potential for Bone Remodeling and Adaptation. Ann Biomed Eng 33, 71–78 (2005). https://doi.org/10.1007/s10439-005-8964-9

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