Assessment of trabecular and cortical architecture and mechanical competence of bone by high-resolution peripheral computed tomography: comparison with transiliac bone biopsy
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Date
2010-02
Publication Type
Journal Article
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yes
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Abstract
Summary
We compared microarchitecture and mechanical competence parameters measured by high-resolution peripheral quantitative computed tomography (HR-pQCT) and finite-element analysis of radius and tibia to those measured by histomorphometry, micro-CT, and finite-element analysis of transiliac bone biopsies. Correlations were weak to moderate between parameters measured on biopsies and scans.
Introduction
HR-pQCT is a new imaging technique that assesses trabecular and cortical bone microarchitecture of the radius and tibia in vivo. The purpose of this study was to determine the extent to which microarchitectural variables measured by HR-pQCT reflect those measured by the “gold standard,” transiliac bone biopsy.
Methods
HR-pQCT scans (Xtreme CT, Scanco Medical AG) and iliac crest bone biopsies were performed in 54 subjects (aged 39 ± 10 years). Biopsies were analyzed by 2D quantitative histomorphometry and 3D microcomputed tomography (µCT). Apparent Young’s modulus, an estimate of mechanical competence or strength, was determined by micro-finite-element analysis (µFE) of biopsy µCT and HR-pQCT images.
Results
The strongest correlations observed were between trabecular parameters (bone volume fraction, number, separation) measured by µCT of biopsies and HR-pQCT of the radius (R 0.365–0.522; P < 0.01). Cortical width of biopsies correlated with cortical thickness by HR-pQCT, but only at the tibia (R = 0.360, P < 0.01). Apparent Young’s modulus calculated by µFE of biopsies correlated with that calculated for both radius (R = 0.442; P < 0.001) and tibia (R = 0.380; P < 0.001) HR-pQCT scans.
Conclusions
The associations between peripheral (HR-pQCT) and axial (transiliac biopsy) measures of microarchitecture and estimated mechanical competence are significant but modest.
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published
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Journal / series
Volume
21 (2)
Pages / Article No.
263 - 273
Publisher
Springer
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Edition / version
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Software
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Date collected
Date created
Subject
bone density; bone imaging; bone structure
Organisational unit
03565 - Müller, Ralph / Müller, Ralph
02518 - Institut für Biomechanik / Institute for Biomechanics