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Titolo:
THE EFFECTS OF DENSITY AND TEST CONDITIONS ON MEASURED COMPRESSION AND SHEAR-STRENGTH OF CANCELLOUS BONE FROM THE LUMBAR VERTEBRAE OF EWES
Autore:
MITTON D; RUMELHART C; HANS D; MEUNIER PJ;
Indirizzi:
INST NATL SCI APPL,MECAN SOLIDES LAB,BAT 304,20 AV A EINSTEIN F-69621VILLEURBANNE FRANCE HOP EDOUARD HERRIOT,INSERM,U403 LYON FRANCE
Titolo Testata:
Medical engineering & physics
fascicolo: 5, volume: 19, anno: 1997,
pagine: 464 - 474
SICI:
1350-4533(1997)19:5<464:TEODAT>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
TRABECULAR BONE; MECHANICAL-PROPERTIES; ELASTIC PROPERTIES; PROXIMAL FEMUR; BEHAVIOR; SPECIMENS;
Keywords:
EWE; CANCELLOUS BONE; COMPRESSIVE STRENGTH; SHEAR STRENGTH; APPARENT DENSITY; ASH DENSITY; DUAL X-RAY ABSORPTIOMETRY; TEMPERATURE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
35
Recensione:
Indirizzi per estratti:
Citazione:
D. Mitton et al., "THE EFFECTS OF DENSITY AND TEST CONDITIONS ON MEASURED COMPRESSION AND SHEAR-STRENGTH OF CANCELLOUS BONE FROM THE LUMBAR VERTEBRAE OF EWES", Medical engineering & physics, 19(5), 1997, pp. 464-474

Abstract

An animal model (the ewe) was used to study mechanical parameters of cancellous bone specimens. Compression and shear tests were conducted on ewe vertebral trabecular bone (L1-L5) from old ewes (mean age: 9 years) under two different conditions: first, at room temperature in air(''standard'' test conditions); and secondly, in a physiological saline bath regulated at 37 degrees C. The parameters obtained under ''standard'' test conditions with a uniaxial compression test were the meanvalue of the maximum strength (sigma(max) = 22.3 (7.06) MPa), Young'smodulus (E = 1510 (784) MPa), the strain at maximum strength (epsilon(sigma max) = 3.21 (0.8) percent) and the energy absorbed during the test (W = 0.3 (0.12) MJ.M-3). No significant change was found when the test was carried out in a saline bath at 37 degrees C (p<0.0005). An original shear test ions performed to evaluate the shear strength whichwas found to vary from 7.5 (4.7) to 14.6 (8.53) MPa under ''standard'' test conditions depending on the method of calculation. Testing of the specimens in a 37 degrees C physiological saline bath induced a decrease in the shear strength from 32.5 percent (p < 0.0005) to 37.3 percent (p < 0.001) of those measured under ''standard'' test conditions. The non-destructive measurement of the Bone Mineral Density (BMD) to 73.3 percent of the maximum compressive strength sigma(max) and 61.5 percent of the maximum shear strength tau(max) determined in saline solution at 37 similar to C. These results showed that other parameters influencing the mechanical properties of trabecular bone and its structure appeared to be essential. (C) 1997 IPEM. Published by Elsevier Science Ltd.

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Documento generato il 24/11/20 alle ore 08:20:18