Heterogeneity in skeletal load adaptation points to a role for modeling in the pathogenesis of osteoporotic fracture

Celeste J. Hamilton, Sophie A. Jamal, Thomas J. Beck, Alia S. Khaled, Jonathan D. Adachi, Jacques P. Brown, Kenneth S. Davison

Research output: Contribution to journalArticle

Abstract

Genetic, environmental, or hormonal factors may cause heterogeneity in skeletal load response. Individuals with reduced sensitivity to load should require higher strains to generate an adaptive response, consequently have weaker bones and fracture more frequently. The purpose of our study was to determine if stresses (proportional to strains) at the femoral neck under equivalent loads were higher in women with a history of fractures compared with women without fractures. We studied postmenopausal women participating in the Canadian Multicentre Osteoporosis Study who had available hip structure analysis data from dual-energy X-ray absorptiometry scans (n=2168). Women were categorized into 2 groups based on their number of self-reported fractures. We computed stress (megapascals) at the inferomedial margin of the femoral neck in a one-legged stance mode using a 2-dimensional engineering beam analysis. We used linear regression (SAS 9.3) to determine associations between stress, geometry parameters, and number of fractures. Postmenopausal women with 1 or more fractures had higher stress (2.6%), lower narrow neck bone mineral density (4.2%), cross-sectional area (3.9%), and section modulus (9.6%) than postmenopausal women without fractures (all p<0.05). These findings provide evidence of heterogeneity in load response and suggest an important role for modeling in the pathogenesis of osteoporotic fracture.

Original languageEnglish (US)
Pages (from-to)170-176
Number of pages7
JournalJournal of Clinical Densitometry
Volume17
Issue number1
DOIs
StatePublished - Jan 1 2014

Keywords

  • Femur
  • Fracture
  • Mechanical load
  • Postmenopausal
  • Stress

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Orthopedics and Sports Medicine
  • Radiology Nuclear Medicine and imaging

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  • Cite this

    Hamilton, C. J., Jamal, S. A., Beck, T. J., Khaled, A. S., Adachi, J. D., Brown, J. P., & Davison, K. S. (2014). Heterogeneity in skeletal load adaptation points to a role for modeling in the pathogenesis of osteoporotic fracture. Journal of Clinical Densitometry, 17(1), 170-176. https://doi.org/10.1016/j.jocd.2013.02.003