کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
874397 910336 2007 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Mechanical testing of cancellous bone from the femoral head: Experimental errors due to off-axis measurements
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی پزشکی
پیش نمایش صفحه اول مقاله
Mechanical testing of cancellous bone from the femoral head: Experimental errors due to off-axis measurements
چکیده انگلیسی

The aim of this study was to verify whether a misalignment between the testing direction and the trabecular main direction has a significant effect on the compressive behaviour of cancellous bone.Ten cylindrical specimens were extracted from femoral heads with a misalignment to the trabecular main direction of approximately 20°. Each specimen was paired with a specimen extracted aligned with the main direction of the trabeculae on the basis of the closest bone volume fraction, obtaining two groups, one ‘aligned’ and one ‘misaligned’. The average off-axis angle was 6.1° and 21.6° for the ‘aligned’ and ‘misaligned’ group, respectively. The specimens underwent micro-tomographic analysis, compressive testing, micro-indentation testing and ashing.No significant differences were found in histomorphometric parameters, hardness and ash density between the two groups, whereas significant differences were found in Young's modulus and ultimate stress: both parameters, measured for the ‘misaligned’ group, were about 40% lower than those measured for the ‘aligned’ group.These results demonstrate a great effect of the angle between the testing direction and the main direction of the trabecular structure on the compressive behaviour of cancellous bone. This angle should be reduced as much as possible (in the present work the average value was 6.6±3.3°), in any case measured, and always reported together with the mechanical parameters of cancellous bone.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Biomechanics - Volume 40, Issue 11, 2007, Pages 2426–2433
نویسندگان
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