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The Combination of Structural Parameters and Areal Bone Mineral Density Improves Relation to Proximal Femur Strength: An In Vitro Study with High-Resolution Peripheral Quantitative Computed Tomography

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Abstract

The aim of this study was to assess structural indices from high-resolution peripheral quantitative computed tomography (HR-pQCT) images of the human proximal femur along with areal bone mineral density (aBMD) and compare the relationship of these parameters to bone strength in vitro. Thirty-one human proximal femur specimens (8 men and 23 women, median age 74 years, range 50–89) were examined with HR-pQCT at four regions of interest (femoral head, neck, major and minor trochanter) with 82 μm and in a subgroup (n = 17) with 41 μm resolution. Separate analyses of cortical and trabecular geometry, volumetric BMD (vBMD), and microarchitectural parameters were obtained. In addition, aBMD by dual-energy X-ray absorptiometry (DXA) was performed at conventional hip regions and maximal compressive strength (MCS) was determined in a side-impact biomechanical test. Twelve cervical and 19 trochanteric fractures were confirmed. Geometry, vBMD, microarchitecture, and aBMD correlated significantly with MCS, with Spearman’s correlation coefficients up to 0.77, 0.89, 0.90, and 0.85 (P < 0.001), respectively. No differences in these correlations were found using 41 μm compared to 82 μm resolution. In multiple regression analysis of MCS, a combined model (age- and sex-adjusted) with aBMD and structural parameters significantly increased R 2 values (up to 0.90) compared to a model holding aBMD alone (R 2 up to 0.78) (P < 0.05). Structural parameters and aBMD are equally related to MCS, and both cortical and trabecular structural parameters obtained from HR-pQCT images hold information on bone strength complementary to that of aBMD.

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Acknowledgments

This work was partially supported by grants from the PhD School of Endocrinology (University of Southern Denmark) and the Region of Southern Denmark. Thanks to Elizabeth Hanmann for performing DXA scans and to Claire Gudex for proofreading and language help.

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Authors and Affiliations

  1. Department of Endocrinology, Odense University Hospital, Kløvervænget 6. 1.sal, 5000, Odense C, Denmark

    Stinus Hansen, Fabian Ahrberg & Kim Brixen

  2. Institute of Clinical Research, University of Southern Denmark, Winsløwparken 19, 5000, Odense C, Denmark

    Stinus Hansen & Kim Brixen

  3. Osteoporosis Research Clinic, Hvidovre University Hospital, Kettegård Alle 30, 2650, Hvidovre, Denmark

    Jens-Erik Beck Jensen

  4. Department of Rheumatology, Aarhus University Hospital, Nørrebrogade 44, 8000, Aarhus, Denmark

    Ellen M. Hauge

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  1. Stinus Hansen
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Correspondence to Stinus Hansen.

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Hansen, S., Jensen, JE.B., Ahrberg, F. et al. The Combination of Structural Parameters and Areal Bone Mineral Density Improves Relation to Proximal Femur Strength: An In Vitro Study with High-Resolution Peripheral Quantitative Computed Tomography. Calcif Tissue Int 89, 335–346 (2011). https://doi.org/10.1007/s00223-011-9523-z

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