MECHANICAL-PROPERTIES OF METAPHYSEAL BONE IN THE PROXIMAL FEMUR
MECHANICAL-PROPERTIES OF METAPHYSEAL BONE IN THE PROXIMAL FEMUR
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DOI：
10.1016/0021-9290(91)90350-v
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发表时间：
1991-01-01
影响因子：
2.4
通讯作者：
HAYES, WC
中科院分区：
文献类型：
--
作者：
LOTZ, JC;GERHART, TN;HAYES, WC
我们使用三点弯曲试验来研究从5个新鲜/冷冻的人类近端股骨的颈部和粗隆间区域的干骺端壳体中获得的123个矩形平板样本的结构行为。 出于比较的目的，还从股骨干的骨制造了36个几何形状相似的样本。 所有样本均在局部纵向或横向方向上取向。 平均纵向弹性模量为9650 +/- 2410（SD）MPa，与使用相同测试技术测量的骨干弹性模量（12500 +/- 2140 MPa）相比降低了24%。 然而，近端（5470 +/- 1720 MPa）和骨干（5990 +/- 1520 MPa）样本之间的横向弹性模量没有显著差异。 干骺端髋臼杯极限拉伸强度的总体平均值纵向为101 +/- 26 MPa，横向为50 +/- 12 MPa。 与骨干值128 +/- 16 MPa和47 +/- 12 MPa相比。 虽然这些差异主要是由于近端样本的密度降低所致，但通过比较纵向与横向模量（1.76）和拉伸强度（2.02）与骨干值（分别为2.09和2.71）的比值，也发现近端样本的横向各向异性略有降低。 使用这些数据应导致改善性能的分析模型的股骨近端，从而有助于集中更多的关注骨小梁的结构贡献的强度和刚度的股骨近端。
We used a three-point bending test to investigate the structural behavior of 123 rectangular flat plate specimens harvested from the metaphyseal shell of the cervical and intertrochanteric regions of five fresh/frozen human proximal femora. For comparison purposes, 36 specimens of similar geometry were also fabricated from bone of the femoral diaphysis. All specimens were oriented in either the local longitudinal or transverse directions. The mean longitudinal elastic modulus was 9650 +/- 2410 (SD) MPa and demonstrated a 24% decrease from that measured for the diaphysis (12500 +/- 2140 MPa) using the same testing technique. However, the transverse elastic moduli did not differ significantly between the proximal (5470 +/- 1720 MPa) and diaphyseal (5990 +/- 1520 MPa) specimens. The globally averaged values for the ultimate tensile strengths of the metaphyseal shell were 101 +/- 26 MPa in the longitudinal and 50 +/- 12 MPa in the transverse directions. These compared with diaphyseal values of 128 +/- 16 MPa and 47 +/- 12 MPa, respectively. While these differences were largely due to the reduced density of the proximal specimens, a slight decrease in transverse anisotropy for the proximal specimens was also noted by comparing the ratio of longitudinal to transverse moduli (1.76) and tensile strength (2.02) to the diaphyseal values (2.09 and 2.71, respectively). Use of these data should lead to improved performance of analytical models for the proximal femur, and thus help focus increased attention on the structural contributions of trabecular bone to the strength and rigidity of the proximal femur.