TY - JOUR
T1 - Noninvasive in vivo monitoring of bone architecture alterations in hindlimb-unloaded female rats using novel three-dimensional microcomputed tomography
AU - David, Valentin
AU - Laroche, Norbert
AU - Boudignon, Benjamin
AU - Lafage-Proust, Marie Hélène
AU - Alexandre, Christian
AU - Ruegsegger, Peter
AU - Vico, Laurence
PY - 2003/9/1
Y1 - 2003/9/1
N2 - We tested a novel microcomputed tomograph designed to longitudinally and noninvasively monitor bone alterations in hindlimb-unloaded female rats at a resolution of 26 μm over a period of 3 weeks. This prototype has a potential to detect three-dimensional trabecular microarchitectural changes induced by growth and unloading. Introduction: Until now, data concerning structural changes of cancellous bone have only been available after necropsy of animals. In this study, we tested a novel microcomputed tomography (μCT) technique designed to monitor such changes repeatedly at a resolution of 26 μm with an acquisition time of about 10 minutes to map the entire proximal tibial metaphysis. Materials and Methods: Four-month-old female Wistar rats were randomized to seven groups of 10 animals to be either tail-suspended or to act as controls. μCT and DXA measurements were performed at 0, 7, 14, and 23 days in suspended and control rats. One group was killed at each of these time points, and bone samples were: processed for histomorphometry and ex vivo μCT. Results: We verified that a good correlation was obtained between two-dimensional bone parameters evaluated in longitudinal tibial sections either by histomorphometry or μCT and μCT parameters obtained from either in vivo or ex vivo tibias. The longitudinal survey allowed earlier detection of both growth and unloading-related bone changes than the transverse survey. In controls, aging induced denser bones, reorganization of the trabecular network toward a more oriented plate-like structure, and an isotropic pattern. Unloading first inhibited cortical and cancellous bone growth and then induced bone loss characterized by fewer trabeculae, reduced connectivity density, and enhanced structure model index (SMI), revealing a lighter cancellous structure with development of rod-like characteristics. Conclusion: We show for the first time that this μCT prototype has a great potential to accurately, repeatedly, reliably, and rapidly investigate alterations of three-dimensional trabecular microarchitecture.
AB - We tested a novel microcomputed tomograph designed to longitudinally and noninvasively monitor bone alterations in hindlimb-unloaded female rats at a resolution of 26 μm over a period of 3 weeks. This prototype has a potential to detect three-dimensional trabecular microarchitectural changes induced by growth and unloading. Introduction: Until now, data concerning structural changes of cancellous bone have only been available after necropsy of animals. In this study, we tested a novel microcomputed tomography (μCT) technique designed to monitor such changes repeatedly at a resolution of 26 μm with an acquisition time of about 10 minutes to map the entire proximal tibial metaphysis. Materials and Methods: Four-month-old female Wistar rats were randomized to seven groups of 10 animals to be either tail-suspended or to act as controls. μCT and DXA measurements were performed at 0, 7, 14, and 23 days in suspended and control rats. One group was killed at each of these time points, and bone samples were: processed for histomorphometry and ex vivo μCT. Results: We verified that a good correlation was obtained between two-dimensional bone parameters evaluated in longitudinal tibial sections either by histomorphometry or μCT and μCT parameters obtained from either in vivo or ex vivo tibias. The longitudinal survey allowed earlier detection of both growth and unloading-related bone changes than the transverse survey. In controls, aging induced denser bones, reorganization of the trabecular network toward a more oriented plate-like structure, and an isotropic pattern. Unloading first inhibited cortical and cancellous bone growth and then induced bone loss characterized by fewer trabeculae, reduced connectivity density, and enhanced structure model index (SMI), revealing a lighter cancellous structure with development of rod-like characteristics. Conclusion: We show for the first time that this μCT prototype has a great potential to accurately, repeatedly, reliably, and rapidly investigate alterations of three-dimensional trabecular microarchitecture.
KW - Bone growth
KW - Bone loss
KW - DXA
KW - Histomorphometry
KW - True three-dimensional microarchitecture
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U2 - 10.1359/jbmr.2003.18.9.1622
DO - 10.1359/jbmr.2003.18.9.1622
M3 - Article
C2 - 12968671
AN - SCOPUS:0041977180
SN - 0884-0431
VL - 18
SP - 1622
EP - 1631
JO - Journal of Bone and Mineral Research
JF - Journal of Bone and Mineral Research
IS - 9
ER -