Abstract
Introduction
Magnetic resonance imaging (MRI) is a promising medical imaging technique that we used to assess femoral neck cortical geometry.
Objectives
Our primary objective was to assess whether cortical bone in the femoral neck assessed by MRI was associated with failure load in a simulated sideways fall, with and without adjustment for total bone size. Our secondary objective was to assess the reliability of the MRI measurements.
Materials and methods
We imaged 34 human cadaveric proximal femora using MRI and dual-energy X-ray absorptiometry (DXA). MRI measurements of cross-sectional geometry at the femoral neck were the cortical cross-sectional area (CoCSAMRI), second area moment of inertia (x axis; IxMRI), and section modulus (x axis; ZxMRI). DXA images were analyzed with the standard Hologic protocol. From DXA, we report the areal bone mineral density (aBMDDXA) in the femoral neck and trochanteric subregions of interest. The femora were loaded to failure at 100 mm/s in a sideways fall configuration (15° internal rotation, 10° adduction).
Results and observations
Failure load (N) was the primary outcome. We observed that the femoral neck CoCSAMRI and IxMRI were strongly associated with failure load (r 2=0.46 and 0.48, respectively). These associations were similar to those between femoral neck aBMD and failure load (r 2=0.40), but lower than the associations between trochanteric aBMD and failure load (r 2=0.70).
Conclusion
We report that MRI holds considerable promise for measuring cortical bone geometry in the femoral neck and for predicting strength at the proximal femur.
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Acknowledgments
We thank Dr. B. Forster for X-ray screening, Dr. A. MacKay for MRI protocol development, S. Renneberg and T. Harris for MRI data acquisition, B. Ko for MRI inter-rater reliability analyses, C. Tang for assistance with mechanical testing, and Drs. K. Khan and D. Cooper for manuscript review. This study was supported by an Establishment Grant from the Michael Smith Foundation for Health Research (MSFHR). S. Manske was supported by the MSFHR and the Natural Sciences and Engineering Research Council of Canada, Dr. Liu-Ambrose was supported by the MSFHR and the Canadian Institutes of Health Research (CIHR) and Dr. McKay is an MSFHR Senior Scholar.
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Manske, S.L., Liu-Ambrose, T., de Bakker, P.M. et al. Femoral neck cortical geometry measured with magnetic resonance imaging is associated with proximal femur strength. Osteoporos Int 17, 1539–1545 (2006). https://doi.org/10.1007/s00198-006-0162-6
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DOI: https://doi.org/10.1007/s00198-006-0162-6