Ultrasonic bone assessment: backscatter difference measurements of the femoral neck in vivo

2020 ◽  
Vol 148 (4) ◽  
pp. 2561-2561
Author(s):  
Kiera L. Downey ◽  
Sarah I. Delahunt ◽  
Loukas A. Georgiou ◽  
Aubrey J. Gray ◽  
Doni M. Thomas ◽  
...  
Keyword(s):  
Femoral Neck ◽  
Bone Assessment

In vivo Performance Evaluation of Bi-Directional Ultrasonic Axial Transmission for Cortical Bone Assessment

2009 ◽  
Vol 35 (6) ◽  
pp. 912-919 ◽  
Author(s):  
M. Talmant ◽  
S. Kolta ◽  
Ch. Roux ◽  
D. Haguenauer ◽  
I. Vedel ◽  
...  
Keyword(s):  
Performance Evaluation ◽  
Cortical Bone ◽  
Bone Assessment ◽  
Axial Transmission

Predicting the Mechanical Outcome of Femoral Neck Fractures Fixed with Cancellous Screws: An In Vivo Study

1998 ◽  
Vol 12 (1) ◽  
pp. 27-36 ◽  
Author(s):  
M. Weinrobe ◽  
C. J. Stankewich ◽  
B. Mueller ◽  
A. F. Tencer
Keyword(s):  
Femoral Neck ◽  
Femoral Neck Fractures ◽  
In Vivo Study ◽  
Cancellous Screws

In Vivo Observations of Hydraulic Stiffening in the Canine Femoral Head

1997 ◽  
Vol 119 (1) ◽  
pp. 103-108 ◽  
Author(s):  
J. A. Ochoa ◽  
A. P. Sanders ◽  
T. W. Kiesler ◽  
D. A. Heck ◽  
J. P. Toombs ◽  
...  
Keyword(s):  
Femoral Head ◽  
Femoral Neck ◽  
Boundary Conditions ◽  
Mechanical Response ◽  
Ex Vivo ◽  
Femoral Cortex ◽  
Hind Limbs ◽  
Femoral Heads ◽  
Fluid Boundary

The role that intertrabecular contents and their boundary conditions have on the dynamic mechanical response of canine femoral heads was investigated in vivo. Femoral heads from paired intact hind limbs of canine specimens were subjected to a sinusoidal strain excitation, at physiologic frequencies, in the cranio-caudal direction. The fluid boundary conditions for the contralateral limbs were changed by predrilling through the lateral femoral cortex and into the femoral neck. The drilling procedure did not invade the head itself. This femoral head fluid boundary alteration reduced the stiffness by 19 percent for testing at 1 Hz. The results of this study demonstrate that fluid stiffening occurs in vivo as previously observed ex vivo.

scholarly journals Experimental Hyperhomocysteinemia Reduces Bone Quality in Rats

2007 ◽  
Vol 53 (8) ◽  
pp. 1455-1461 ◽  
Author(s):  
Markus Herrmann ◽  
Britt Wildemann ◽  
Lutz Claes ◽  
Stefan Klohs ◽  
Michael Ohnmacht ◽  
...  
Keyword(s):  
Femoral Neck ◽  
Bone Quality ◽  
Distal Femur ◽  
Bone Fragility ◽  
Control Group ◽  
Bone Resorption Marker ◽  
Bone Area ◽  
Bone Formation Marker ◽  
Turnover Markers

Abstract Background: Recently, hyperhomocysteinemia (HHCY) has been suggested as a new risk factor for osteoporosis. This study investigated if HHCY is a causal osteoporotic factor in vivo. Methods: We used 3 groups of rats: a control group (n = 20), a moderate HHCY group (induced by a 2.4% methionine-enriched diet, n = 10), and an intermediate HHCY group (induced by a 2% homocystine-enriched diet, n = 10). We measured bone fragility [maximum force of an axial compression test (Fmax)], bone area as percentage of total area (BAr/TAr, histomorphometry), and biochemical bone turnover markers [osteocalcin (OC) and collagen I C-terminal crosslaps (CTx)]. Results: Compared with controls, 3 months of moderate or intermediate HHCY increased mean (SD) bone fragility at the femoral neck by 18% (6%) in methionine-fed (P = 0.001) and 36% (13%) in homocystine-fed rats (P <0.001). Mean (SD) BAr/TAr at the distal femur in methionine and homocystine groups was decreased by 45% (21%; P = 0.001) and 93% (9%; P = 0.001), respectively. At the femoral neck, BAr/TAr was decreased by 19% (11%; P <0.001) and 55% (19%; P <0.001). At the lumbar spine, the reduction of BAr/TAr was 17% (23%; P = 0.099) and 44% (19%; P <0.001). Plasma OC (bone formation marker) was decreased by 23% (20%; P = 0.006) and 34% (21%; P <0.001). Plasma CTx (bone resorption marker) did not differ between groups. Conclusion: Bone quality is consistently decreased in the presence of increased circulating homocysteine. The results provide evidence that HHCY is a causal osteoporotic factor.

Can the Weight-Bearing Capacity of the Femoral Neck be Estimated by Physical Measurements on the Greater Trochanter?

1988 ◽  
Vol 17 (2) ◽  
pp. 59-62 ◽  
Author(s):  
I Leichter ◽  
A Simkin ◽  
J Y Margulies ◽  
A Bivas ◽  
I Roman ◽  
...  
Keyword(s):  
Femoral Neck ◽  
Bone Structure ◽  
Mass Density ◽  
Weight Bearing ◽  
Clinical Problem ◽  
Mineral Density ◽  
Greater Trochanter ◽  
In Vivo Measurements ◽  
Physical Measurements

Early detection of mechanical weakening of the femoral neck would help to prevent fractures at this site which are the most serious clinical problem in osteoporosis. In the vicinity of the femoral neck, the greater trochanter is a superficial bone structure more easily accessible to in vivo measurements. The purpose of the present study was to evaluate the relation between the strength of the femoral neck and the composition of the trabecular tissue in the greater trochanter. Twenty-nine fresh human intact femora were examined. The relationship between the average shear stress in failure of the femoral neck (ASS) and the Ca concentration (CC), mineral density (BMD), and overall mass density (BD) of the greater trochanter was investigated. Linear stepwise regression analysis showed that the ASS of the femoral neck can be predicted from the BD, CC, and BMD of the trochanteric tissue, and their contribution to the estimation of the ASS was ranked in the above order. The linear function relating the ASS to these variables showed a highly significant multiple correlation ( R = 0.87, p < 0.001). Therefore in vivo measurements of the density and mineral content in the greater trochanter should be considered useful in assessing the risk of fracture of the femoral neck.

Bone resorption at the femoral neck is dependent on local factors in nonosteoporotic late postmenopausal women: An in vitro-in vivo study

2009 ◽  
Vol 10 (2) ◽  
pp. 307-314 ◽  
Author(s):  
M.E. Cohen-Solal ◽  
A.M. Graulet ◽  
J. Gueris ◽  
M.A. Denne ◽  
C. Bergot ◽  
...  
Keyword(s):  
Bone Resorption ◽  
Femoral Neck ◽  
Postmenopausal Women ◽  
In Vivo Study ◽  
Local Factors

scholarly journals Stability of fixation in femoral neck fractures: Comparison of four fixation devices in vivo and in cadavers

1987 ◽  
Vol 58 (2) ◽  
pp. 109-112 ◽  
Author(s):  
Stefan Elmerson ◽  
Gunnar B. J. Andersson ◽  
Malcolm H. Pope ◽  
Carl Zetterberg
Keyword(s):  
Femoral Neck ◽  
Femoral Neck Fractures ◽  
Fixation Devices
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