The fixation of the cemented femoral component - Effects of stem stiffness, cement thickness and roughness of the cement-bone surface
The fixation of the cemented femoral component - Effects of stem stiffness, cement thickness and roughness of the cement-bone surface
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DOI：
10.1302/0301-620x.82b2
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发表时间：
2000-03-01
影响因子：
--
通讯作者：
Leyvraz, PF
中科院分区：
文献类型：
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作者：
Ramaniraka, NA;Rakotomanana, LR;Leyvraz, PF
骨水泥全髋关节置换术(THA)后，骨水泥-骨柄或骨水泥-骨界面处均有可能发生断裂。这是由于骨水泥内发生了异常高的剪应力和压应力以及相对微动量过大造成的。因此，我们评估了钛和铬钴杆在水泥-骨和水泥-骨柄界面处的微移动和应力。两种种植体的行为相似，就茎的硬度而言，两种种植体界面上的微移动大小和分布没有实质性差异。当水泥套层厚度为3~4 mm时，微移动最小，但随着水泥厚度的增加，微移动增加。当骨水泥厚度小于2 mm时，当骨柄由钛制成时，会出现异常高的微动。表面粗糙度的相对减少增加了骨水泥-骨界面处的滑移，但减少了骨水泥-骨界面的脱粘。在不同的骨水泥-骨摩擦系数下，该部位的剪应力没有显着变化，而骨水泥内的压应力和环向应力略有增加。
After cemented total hip arthroplasty (THA) there may be failure at either the cement-stem or the cement-bone interface. This results from the occurrence of abnormally high shear and compressive stresses within the cement and excessive relative micromovement.We therefore evaluated micromovement and stress at the cement-bone and cement-stem interfaces for a titanium and a chromium-cobalt stem. The behaviour of both implants was similar and no substantial differences were found in the size and distribution of micromovement on either interface with respect to the stiffness of the stem.Micromovement was minimal with a cement mantle 3 to 4 mm thick but then increased with greater thickness of the cement. Abnormally high micromovement occurred when the cement was thinner than 2 mm and the stem was made of titanium.The relative decrease in surface roughness augmented slipping but decreased debonding at the cement-bone interface. Shear stress at this site did not vary significantly for the different coefficients of cement-bone friction while compressive and hoop stresses within the cement increased slightly.