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Lamellar thickness measurements in control and osteogenesis imperfecta human bone, with development of a method of automated thickness averaging to simplify quantitation. | LitMetric

AI Article Synopsis

Article Abstract

Lamellar bone that forms in moderate and severe osteogenesis imperfecta (OI) is composed of structurally irregular lamellae compared to those in control bone. OI and control cortical bone fragments were prepared for light microscopy in standardized fashion: decalcified, embedded in plastic, sectioned and stained with toluidine blue. Polarization light microscopy (PLM) was used to demonstrate and quantify bright and dark lamellar thicknesses in cortical bone fragments from 5 patients with moderate to severe OI in whom type I collagen structural/molecular defects were detected and in control bone from 5 patients. Rigid selection criteria identified lamellar regions for quantification. Thicknesses of bright and dark lamellae were measured manually at 20X magnification using a histomorphometric image analysis system. A method of automated thickness averaging was developed to determine lamellar thicknesses from PLM images to make measurement faster. Our study demonstrates, for the first time, that in OI bone from patients with type I collagen structural/molecular defects mean lamellar thickness measurements (along with the bright and dark lamellar thicknesses) were less than those in control bone by statistically highly significant differences. The mean value for bright lamellae was less than that for dark lamellae in both control and OI bone. The ratio of mean values for bright/dark lamellar thicknesses was the same in control and OI bone. The automated method obtained similar results to the manual method. Lamellar bone in moderate and severe OI with type I collagen defects is composed of thinner and less structurally regular lamellae than those in control bone. This finding indicates that lamellar thickness measurements can be helpful in assessing the effect of specific collagen and collagen-related mutations on OI bone synthesis and warrant inclusion in research and clinical histomorphometric assessments.

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Source
http://dx.doi.org/10.1016/j.matbio.2022.12.006DOI Listing

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