Increased Variability of Bone Tissue Mineral Density Resulting from Estrogen Deficiency Influences Creep Behavior in a Rat Vertebral Body

Overview

Journal Bone

Specialties Endocrinology
Orthopedics

Date 2012 Sep 5

PMID 22944606

Citations 12

Authors

Do-Gyoon Kim

Anand R Navalgund

Boon Ching Tee

Garrett J Noble

Richard T Hart

Hye Ri Lee

Affiliations

Soon will be listed here.

Abstract

Progressive vertebral deformation increases the fracture risk of a vertebral body in the postmenopausal patient. Many studies have observed that bone can demonstrate creep behavior, defined as continued time-dependent deformation even when mechanical loading is held constant. Creep is a characteristic of viscoelastic behavior, which is common in biological materials. We hypothesized that estrogen deficiency-dependent alteration of the mineral distribution of bone at the tissue level could influence the progressive postmenopausal vertebral deformity that is observed as the creep response at the organ level. The objective of this study was thus to examine whether the creep behavior of vertebral bone is changed by estrogen deficiency, and to determine which bone property parameters are responsible for the creep response of vertebral bone at physiological loading levels using an ovariectomized (OVX) rat model. Correlations of creep parameters with bone mineral density (BMD), tissue mineral density (TMD) and architectural parameters of both OVX and sham surgery vertebral bone were tested. As the vertebral creep was not fully recovered during the post-creep unloading period, there was substantial residual displacement for both the sham and OVX groups. A strong positive correlation between loading creep and residual displacement was found (r=0.868, p<0.001). Of the various parameters studied, TMD variability was the parameter that best predicted the creep behavior of the OVX group (p<0.038). The current results indicated that creep caused progressive, permanent reduction in vertebral height for both the sham and OVX groups. In addition, estrogen deficiency-induced active bone remodeling increased variability of trabecular TMD in the OVX group. Taken together, these results suggest that increased variability of trabecular TMD resulting from high bone turnover influences creep behavior of the OVX vertebrae.

Citing Articles

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Lee B, Murray C, Liu J, Kim M, Hwang M, Yueh T Front Bioeng Biotechnol. 2023; 11:1243303.

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Multiscale characterization of ovariectomized rat femur.

Liu J, Kim E, Ni A, Kim Y, Zheng F, Lee B J Biomech. 2021; 122:110462.

PMID: 33915473 PMC: 8166321. DOI: 10.1016/j.jbiomech.2021.110462.

Regional variations of jaw bone characteristics in an ovariectomized rat model.

Watanabe K, Lewis S, Guo X, Ni A, Lee B, Deguchi T J Mech Behav Biomed Mater. 2020; 110:103952.

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The relationship of whole human vertebral body creep to geometric, microstructural, and material properties.

Oravec D, Kim W, Flynn M, Yeni Y J Biomech. 2018; 73:92-98.

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