Moderate-to-heavy smoking in women is potentially associated with compromised cortical porosity and stiffness at the distal radius.

Abstract:

:Though smokers have poor clinical outcomes after treatment for fractures, the skeletal effects of smoking are still debated. Our results showed that female smokers had 33% higher cortical bone porosity. Smoking targets cortical compartment microstructure and mechanics, and micron-scale variables are essential to better understand the specific effects of smoking. PURPOSE:Smokers have poor outcomes in the clinic after treatment for fractures. However, skeletal effects of smoking are still debated. Inconsistencies in published data are likely due to macro-scale variables used to characterize bone differences due to smoking. Therefore, our goal was to characterize distal radius microstructure and macrostructure differences between smokers and non-smokers, and determine the degree to which smoking is associated with compartment-specific mechanical differences resulting from compromised cortical-trabecular microstructure. METHODS:Data were acquired from 46 female smokers (35 to 64 years old), and 45 age- and body mass-matched female non-smokers. Distal radius microstructure and mechanical variables were determined from high-resolution peripheral quantitative computed tomography (HR-pQCT) images and multiscale finite element analysis. Distal radius macro-scale variables (bone volume, bone mineral content, volumetric bone mineral density [vBMD]) were determined from low-resolution images. RESULTS:Age- and body mass index-adjusted results showed that cortical porosity was 33% higher (p < 0.01), and that cortical vBMD and stiffness were 3% and 8% lower, respectively (p < 0.05), among smokers. We also observed unloading of the cortical compartment in smokers. There were no differences in the macro-scale variables. Average HR-pQCT-derived vBMD was 8% lower (p < 0.05) in smokers corresponding to 5 years of postmenopausal loss. CONCLUSION:Skeletal effects of smoking become evident at the micron level through a structurally and mechanically compromised cortical compartment, which partially explains the inconsistent results observed at the macro-level, and the poor clinical outcomes. Smoking may also compound postmenopausal effects on bone potentially placing women having undergone menopause at a greater risk for fracture.

journal_name

Arch Osteoporos

journal_title

Archives of osteoporosis

authors

Johnson JE,Troy KL

doi

10.1007/s11657-018-0504-y

subject

Has Abstract

pub_date

2018-08-23 00:00:00

pages

89

issue

1

eissn

1862-3522

issn

1862-3514

pii

10.1007/s11657-018-0504-y

journal_volume

13

pub_type

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