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首页> 外文期刊>Journal of biomedical materials research. Part B, Applied biomaterials. >Comparison of ceramic-on-metal and metal-on-metal hip prostheses under adverse conditions
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Comparison of ceramic-on-metal and metal-on-metal hip prostheses under adverse conditions

机译：不利条件下金属陶瓷和金属金属髋关节假体的比较

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Ceramic-on-metal (COM) hip replacements, where the head is BIOLOX? Delta ceramic and the liner is CoCrMo alloy, have demonstrated reduced wear under standard simulator conditions compared to metal-on-metal (MOM) bearings. COM hips are now being used clinically around the world. MOM hip resurfacings have raised concerns regarding poor clinical performance and increased in vivo wear was associated with steeply inclined acetabular components and translationally malpositioned components. The aim of this study was to compare the wear rates of MOM and COM total hip prostheses under adverse edge-loading conditions in a hip simulator test. COM and MOM 36 mm hip prostheses were tested in a hip simulator, with liners mounted to provide a clinical inclination angle of 55°. A simplified gait cycle and microseparation conditions were applied for two million cycles in 25% new born calf serum. The overall mean volumetric wear rate of COM bearings under adverse conditions was 0.36 ± 0.55 mm3/million cycles; this was significantly less than MOM wear (1.32 ± 0.91 mm3/million cycles). Under these adverse conditions; the contact zone on the head intersects the rim of the cup causing substantially elevated contact stresses, disrupting the protective boundary and mixed lubrication regime causing changes in types and severity of wear mechanisms. In COM bearings, the harder head does not become damaged when there is lubricant starvation and wear does not accelerate. In conclusion, COM bearings showed reduced wear compared to MOM bearings under standard and adverse clinically relevant simulator conditions and COM bearings may provide an advantage over MOM bearings under edge-loading conditions clinically.
机译：金属陶瓷（COM）髋关节替代品，BIOLOX的头在哪里？ Delta陶瓷和衬套为CoCrMo合金，与金属对金属（MOM）轴承相比，在标准模拟器条件下已证明减少了磨损。现在，COM髋关节已在全球范围内被临床使用。 MOM髋关节表面置换术引起了人们对不良临床表现的担忧，并且体内磨损的增加与髋臼髋臼组件和倾斜组件错位有关。这项研究的目的是在髋部模拟器测试中比较在不利的边缘负荷条件下MOM和COM全髋关节假体的磨损率。 COM和MOM 36毫米髋关节假体在髋关节模拟器中进行了测试，并安装了衬管以提供55°的临床倾斜角。在25％的新生小牛血清中应用简化的步态周期和微分离条件进行200万个周期。在不利条件下，COM轴承的整体平均体积磨损率为0.36±0.55 mm3 /百万个循环;这显着小于MOM磨损（1.32±0.91 mm3 /百万次循环）。在这些不利条件下;头部的接触区域与杯的边缘相交，导致接触应力大大增加，破坏了保护边界，混合润滑方式导致磨损机制的类型和严重性发生变化。在COM轴承中，当润滑油不足时，较硬的磁头不会损坏，并且磨损不会加速。总之，在标准和不利的临床相关模拟器条件下，COM轴承比MOM轴承具有更低的磨损，并且在临床边缘负荷条件下，COM轴承可能比MOM轴承更具优势。

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