An in vitro study of the strain distribution in human femora with anatomical and customised femoral stems
An in vitro study of the strain distribution in human femora with anatomical and customised femoral stems
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DOI：
10.1302/0301-620x.91b5.21749
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发表时间：
2009-05-01
影响因子：
--
通讯作者：
Aamodt, A.
中科院分区：
文献类型：
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作者：
Ostbyhaug, P. O.;Klaksvik, J.;Aamodt, A.
羟基磷灰石涂层标准解剖型和定制股骨柄设计用于将载荷传递到股骨近端的干骺端部分，以避免应力遮挡并减少骨吸收。在一项随机体外研究中，我们比较了在12对人类尸体股骨中插入羟基磷灰石涂层标准解剖型和定制型股骨柄后皮质应变模式的变化。髋关节模拟器再现了单腿站立和爬楼梯时股骨近端的生理负荷。在插入股骨柄前后测量皮质应变，与定制股骨柄相比，插入解剖型股骨柄后，在Gruen区7、6、5、3和2观察到显著更高的应变屏蔽。对于解剖型股骨柄，股骨上的环向应变也表明载荷转移到股骨近端干骺端下部或骨干上部的皮质骨。定制型股骨柄诱导的应变模式比标准解剖型股骨柄更类似于完整股骨。
Hydroxyapatite-coated standard anatomical and customised femoral stems are designed to transmit load to the metaphyseal part of the proximal femur in order to avoid stress shielding and to reduce resorption of bone. In a randomised in vitro study, we compared the changes in the pattern of cortical strain after the insertion of hydroxyapatite-coated standard anatomical and customised stems in 12 pairs of human cadaver femora. A hip simulator reproduced the physiological loads on the proximal femur in single-leg stance and stair-climbing. The cortical strains were measured before and after the insertion of the stems.Significantly higher strain shielding was seen in Gruen zones 7, 6, 5, 3 and 2 after the insertion of the anatomical stem compared with the customised stem. For the anatomical stem, the hoop strains on the femur also indicated that the load was transferred to the cortical bone at the lower metaphyseal or upper diaphyseal part of the proximal femur.The customised stem induced a strain pattern more similar to that of the intact femur than the standard, anatomical stem.