Measurement of the velocity of ultrasound in the human femur in vivo

1980 ◽  
Vol 7 (4) ◽  
pp. 324-330 ◽  
Author(s):  
Michael P. André ◽  
J. Duncan Craven ◽  
Moses A. Greenfield ◽  
Richard Stern
Keyword(s):  
Human Femur ◽  
Velocity Of Ultrasound

Subperiosteal expansion and cortical remodeling of the human femur and tibia with aging

Science ◽  
1982 ◽  
Vol 217 (4563) ◽  
pp. 945-948 ◽  
Author(s):  
CB Ruff ◽  
WC Hayes
Keyword(s):  
Cross Sections ◽  
Lower Limb ◽  
Torsional Rigidity ◽  
American Southwest ◽  
Cross Sectional ◽  
Human Femur ◽  
Second Moments

Increases with aging in subperiosteal dimensions and second moments of area (measures of bending and torsional rigidity) in femoral and tibial cross sections are documented in an archeological sample from the American Southwest. Significant differences between cross-sectional sites and between sexes in the pattern of cortical remodeling with age are also present. These differences appear to be related to variations in the stress or strain levels in different regions of the femur and tibia which result from in vivo mechanical loadings of the lower limb.

In vivo measurements show tensile axial strain in the proximal lateral aspect of the human femur

1997 ◽  
Vol 15 (6) ◽  
pp. 927-931 ◽  
Author(s):  
A. Aamodt ◽  
J. Lund-Larsen ◽  
J. Eine ◽  
E. Andersen ◽  
P. Benum ◽  
...  
Keyword(s):  
Axial Strain ◽  
Lateral Aspect ◽  
Human Femur ◽  
In Vivo Measurements

scholarly journals CAD modelling of the human femur taking into account the structure of the bone

2021 ◽  
Vol 343 ◽  
pp. 04010
Author(s):  
Andrei Horia Brănescu ◽  
Ioana-Codruţa Lebădă ◽  
Vlăduţ Mihuţ ◽  
Nenad Marjanovic ◽  
Milan Rackov
Keyword(s):  
Bone Structure ◽  
Anatomical Study ◽  
3D Models ◽  
Biomechanical Study ◽  
Heterogeneous Structure ◽  
Surgical Interventions ◽  
Human Femur ◽  
Great Utility ◽  
Cad Modelling

The use of 3D models of the human bone system has great utility in the biomechanical study, due to the fact that these structures cannot be analyzed or tested in vivo. Within this paper, taking into consideration its real bone structure, the human femur CAD modelling is established. Firstly, a preliminary anatomical study is done, in order to highlight the fact that the thigh bone is a heterogeneous structure, consisting of several entities with different mechanical characteristics. The modelling starts from a homogenous 3D model of the femur, from which, every single separate entity is designed and finally they are assembled within a single product assembly. Therefore, the final result ensures a complex CAD structure, able to get assigned different material properties, specific for each entity this modelling furtherly allows the characteristic pathological structures studies of the referred entity or to simulate specific surgical interventions.

In-vivo measurement of osteoporotic bone fragility with apparent velocity of ultrasound

2003 ◽  
Author(s):  
G. Brandenburger ◽  
L. Avioli ◽  
C. Chesnut ◽  
R. Heaney ◽  
R. Poss ◽  
...  
Keyword(s):  
Bone Fragility ◽  
Osteoporotic Bone ◽  
Apparent Velocity ◽  
In Vivo Measurement ◽  
Velocity Of Ultrasound

Fine Structural Changes in the Microvasculature of the Mouse Pinna: Aging and Radiation Injury

1974 ◽  
Vol 32 ◽  
pp. 54-55
Author(s):  
S. Phyllis Steamer ◽  
Rosemarie L. Devine
Keyword(s):  
Structural Changes ◽  
Radiation Treatment ◽  
Arterial Stenosis ◽  
Ultrastructural Changes ◽  
Vascular Effects ◽  
Microvascular Changes ◽  
Surrounding Connective Tissue ◽  
Fission Neutrons ◽  
Total Body

The importance of radiation damage to the skin and its vasculature was recognized by the early radiologists. In more recent studies, vascular effects were shown to involve the endothelium as well as the surrounding connective tissue. Microvascular changes in the mouse pinna were studied in vivo and recorded photographically over a period of 12-18 months. Radiation treatment at 110 days of age was total body exposure to either 240 rad fission neutrons or 855 rad 60Co gamma rays. After in vivo observations in control and irradiated mice, animals were sacrificed for examination of changes in vascular fine structure. Vessels were selected from regions of specific interest that had been identified on photomicrographs. Prominent ultrastructural changes can be attributed to aging as well as to radiation treatment. Of principal concern were determinations of ultrastructural changes associated with venous dilatations, segmental arterial stenosis and tortuosities of both veins and arteries, effects that had been identified on the basis of light microscopic observations. Tortuosities and irregularly dilated vein segments were related to both aging and radiation changes but arterial stenosis was observed only in irradiated animals.

Induction and Differentiation of Dental Epithelium in Vivo and in Vitro

1982 ◽  
Vol 40 ◽  
pp. 142-145
Author(s):  
E. J. Kollar
Keyword(s):  
Connective Tissue ◽  
Oral Mucosa ◽  
Basal Lamina ◽  
Functional Derivatives ◽  
Specific Source ◽  
Dental Epithelium ◽  
Connective Tissue Stroma

The differentiation and maintenance of many specialized epithelial structures are dependent on the underlying connective tissue stroma and on an intact basal lamina. These requirements are especially stringent in the development and maintenance of the skin and oral mucosa. The keratinization patterns of thin or thick cornified layers as well as the appearance of specialized functional derivatives such as hair and teeth can be correlated with the specific source of stroma which supports these differentiated expressions.

Ultrastructural Correlations between Clonal Human Tumor Colonies and in Vivo Neoplasms

1982 ◽  
Vol 40 ◽  
pp. 210-211
Author(s):  
M.J. Murphy ◽  
R.R. Price ◽  
J.C. Sloman
Keyword(s):  
Cultured Cells ◽  
Human Tumor ◽  
Cell Type ◽  
Tumor Mass ◽  
Initial Cell ◽  
Cloning Assay ◽  
Human Tumor Cloning ◽  
The Relationship

The in vitro human tumor cloning assay originally described by Salmon and Hamburger has been applied recently to the investigation of differential anti-tumor drug sensitivities over a broad range of human neoplasms. A major problem in the acceptance of this technique has been the question of the relationship between the cultured cells and the original patient tumor, i.e., whether the colonies that develop derive from the neoplasm or from some other cell type within the initial cell population. A study of the ultrastructural morphology of the cultured cells vs. patient tumor has therefore been undertaken to resolve this question. Direct correlation was assured by division of a common tumor mass at surgical resection, one biopsy being fixed for TEM studies, the second being rapidly transported to the laboratory for culture.

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