scholarly journals Comparison of in Vitro Young and Old Lumbar Vertebrae of Ewes Related to Bone Density and Compression Strength

2017 ◽  
Vol 11 (4) ◽  
pp. 65 ◽  
Author(s):  
Sahar Ahmed Abdalbary ◽  
Sherif Mamdouh Amr
Keyword(s):  
Mechanical Properties ◽  
Bone Mineral Density ◽  
Animal Model ◽  
Bone Mineral ◽  
Lumbar Vertebrae ◽  
Compressive Force ◽  
Fixation Strength ◽  
Mineral Density ◽  
Orthopedic Device

An animal model (the ewe) was used to study the mechanical properties of lumbar vertebrae and to compare these properties with the bone mineral density. We measured the bone mineral density for lumbar vertebrae of 10 ewes for L2 & L5 for5 young ewes mean age 2 years and 5 old ewes mean age 8 years old. Compression test was conducted on ewes lumbar vertebrae L2 & l5 for young ewes and old ewes.There was significance differences between both group related to bone mineral density , compressive force , and young’s modulus. There was strong correlation between the mechanical properties and bone mineral density.Bone mineral density correlated with the mechanical properties and it is not surprising that an orthopedic device used with poorly mineralized bone can have lower mechanical fixation strength than the same device with well-mineralized bone.

Local Variation in Femoral Neck Cortical Bone: In Vitro Measured Bone Mineral Density, Geometry and Mechanical Properties

2017 ◽  
Vol 20 (2) ◽  
pp. 205-215 ◽  
Author(s):  
Louise V. Coutts ◽  
Thomas Jenkins ◽  
Richard O.C. Oreffo ◽  
Doug G. Dunlop ◽  
Cyrus Cooper ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Bone Mineral Density ◽  
Femoral Neck ◽  
Cortical Bone ◽  
Bone Mineral ◽  
Local Variation ◽  
Mineral Density

Changes in Bone Mineral Density and Mechanical Properties Due to Alcohol and Ovariectomy in Trabecular Bone of Female Rats

2002 ◽  
Author(s):  
Harry A. Hogan ◽  
H. Wayne Sampson
Keyword(s):  
Mechanical Properties ◽  
Bone Mineral Density ◽  
Animal Model ◽  
Risk Factor ◽  
Alcohol Consumption ◽  
Trabecular Bone ◽  
Bone Mineral ◽  
Female Rats ◽  
Mineral Density ◽  
Rat Animal Model

Alcohol consumption is a known risk factor exacerbating postmenopausal osteoporosis [1,2]. The current study was undertaken to investigate these effects using the rat animal model. Recent studies with rats have shown deleterious effects due to alcohol [3,4], but no significant effects when combined estrogen deficiency induced by ovariectomy (OVX) [5]. This last study did not report mechanical properties, however. The objective of the current study was to investigate the effects of alcohol and OVX on trabecular bone mechanical properties and bone mineral density (BMD) in adult female rats. An important issue in evaluating osteoporosis and related bone maladies clinically is the relation between bone mineral density (BMD) and fracture risk or incidence. Thus, an additional goal of the current study was to examine the relationships (correlations) between trabecular bone BMD and mechanical properties.

scholarly journals Jumping exercise preserves bone mineral density and mechanical properties in osteopenic ovariectomized rats even following established osteopenia

2017 ◽  
Vol 28 (4) ◽  
pp. 1461-1471 ◽  
Author(s):  
R . Okubo ◽  
L. S. Sanada ◽  
V. A. Castania ◽  
M. J. Q. Louzada ◽  
F. J. A. de Paula ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Bone Mineral Density ◽  
Bone Mineral ◽  
Ovariectomized Rats ◽  
Mineral Density ◽  
Jumping Exercise

scholarly journals Heterogeneity of Bone Mineral Density and Fatigue Failure of Human Vertebrae

2012 ◽  
Author(s):  
Yener N. Yeni ◽  
Laila M. Poisson ◽  
Michael J. Flynn
Keyword(s):  
Mechanical Properties ◽  
Bone Mineral Density ◽  
Vertebral Fracture ◽  
Bone Mineral ◽  
Vertebral Fractures ◽  
Important Determinant ◽  
Fatigue Properties ◽  
Static Properties ◽  
Mineral Density ◽  
Significant Interest

Bone qualities that are measurable via clinically available modalities and that can explain fracture risk beyond what is explainable by bone mineral density (BMD) are of significant interest. Evidence from literature suggests that the heterogeneity of BMD within a vertebra, in addition to the average BMD, may be an important determinant of the mechanical properties of a vertebra 1–3 and risk of a clinical vertebral fracture 4. Much of the experimental evidence comes from tests, in which vertebrae are monotonically loaded and relates BMD heterogeneity to the quasi-static properties of a vertebra 1, 3. The appearance of clinical vertebral fractures is in the form of progressive deformities indicating that fatigue processes are involved. However, the relationships between BMD heterogeneity and fatigue properties of a vertebra are not well-understood.

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