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Bone mineral density and bone structure parameters as predictors of bone strength: an analysis using computerized microtomography and gastrectomy-induced osteopenia in the rat
Linköping University, Department of Medicine and Health Sciences, Radiation Physics . Linköping University, Faculty of Health Sciences.
Linköping University, Department of Medicine and Health Sciences, Radiation Physics . Linköping University, Faculty of Health Sciences.
Department of Radiology, Centre for Oral Health, Malmö University, Sweden.
Institute for Surgical Research, Rikshospitalet, Oslo, Norway.
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2000 (English)In: Journal of Biomechanics, ISSN 0021-9290, Vol. 33, no 3, 289-297 p.Article in journal (Refereed) Published
Abstract [en]

In this study the relationships of bone mineral density (BMD) and bone structure parameters calculated from 2D microtomography images to bone strength were investigated. Femurs from 21 male Sprague Dawley rats were subjected to dual-energy X-ray absorptiometry, computerized microtomography (CμT) and either three-point cantilever bending (femoral shaft) or two-point bending compression (femoral neck). Gastrectomy was performed on 12 animals and 9 were sham operated. From the tomograms bone structure analysis was performed using a software routine based on grey level run-length method. Correlations of BMD and bone structure parameters to mechanical parameters were investigated as were differences between the gastrectomized and the control samples. The reductions of BMD between the groups were 21 and 27% in the femoral neck and shaft, respectively. For the shaft, the correlations of BMD to all mechanical parameters were significant and BMD was a consistent predictor of bone strength for cortical bone. However, in the femoral neck where cancellous bone predominates, BMD was weakly correlated only to deflection. A significant correlation between trabecular thickness and neck bone strength was found. Hence, compared to trabecular thickness, BMD was of limited value in predicting bone strength in the femoral neck.

Place, publisher, year, edition, pages
2000. Vol. 33, no 3, 289-297 p.
Keyword [en]
Computerised microtomography, Bone structure, Bone strength, Bone mineral density, Osteopenia
National Category
Medical and Health Sciences
Identifiers
URN: urn:nbn:se:liu:diva-13568DOI: 10.1016/S0021-9290(99)00181-5OAI: oai:DiVA.org:liu-13568DiVA: diva2:20968
Available from: 2001-02-20 Created: 2001-02-20 Last updated: 2015-03-20
In thesis
1. Computerised Microtomography: Non-invasive imaging and analysis of biological samples, with special reference to monitoring development of osteoporosis in small animals
Open this publication in new window or tab >>Computerised Microtomography: Non-invasive imaging and analysis of biological samples, with special reference to monitoring development of osteoporosis in small animals
2001 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The use of Computerised microtomography (CμT) in biomedical research is well established, with most applications developed at synchrotron facilities. The possibility to non-invasively monitor morphological changes in biological samples, makes it an attractive technique in biomedicine. However, high absorbed doses and long examination times are a disadvantage that limits the possibilities of performing longitudinal examinations.

The aim of this work was to optimise CmT using conventional X-ray tubes for applications in non-destructive material testing and for skeleton research in small animals (rat). A calculational model of the imaging system was developed and used to optimise the relation between image quality, expressed as the signal-to-noise ratio (SNR) in detecting a contrasting detail, and imaging time in material testing. The model was modified to optimise the relation between the SNR in detecting a trabecular detail in cancelleous bone and the mean absorbed dose in spongiosa and skin for (rat) tibia and femur.

Gastrectomized Sprague-Dawley rats were used to initiate osteoporotic changes. In order to detect differences in between gastrectomized rats and controls, spatial resolutions of 150 mm or better were needed. The minimum absorbed doses in femur spongiosa at SNR = 5 were 1mGy - 700 mGy at spatial resolutions from 100 mm to10 mm. In femur skin, the corresponding minimum absorbed doses were 2 mGy - 2000 mGy. Corresponding values for tibia were 0.3 mGy - 300 mGy for both spongiosa and skin (spatial resolution of 100 mm to10 mm). Taking 0.5 Gy as the tolerance limit for the spongiosa dose, longitudinal studies with six repeated examinations will be possible at a spatial resolution of 25 mm in femur and 17 examinations in tibia.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2001. 59 p.
Series
Linköping University Medical Dissertations, ISSN 0345-0082 ; 656
Keyword
Computed microtomography, CμT, signal-to-noise ratio (SNR), non-invasive monitoring, morphological changes, Gastrectomized Sprague-Dawley, osteoporosis
National Category
Medical and Health Sciences
Identifiers
urn:nbn:se:liu:diva-5030 (URN)91-7219-757-9 (ISBN)
Public defence
2002-01-19, Brännströms sal, Hälsouniversitetet, Campus US, Linköpings universitet, Linköping, 09:00 (English)
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Available from: 2001-02-20 Created: 2001-02-20 Last updated: 2015-03-20Bibliographically approved

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Olander, BirgerAlm Carlsson, Gudrun

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