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首页> 外文期刊>Journal of orthopaedic research >Micromotions at the taper interface between stem and neck adapter of a bimodular hip prosthesis during activities of daily living
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Micromotions at the taper interface between stem and neck adapter of a bimodular hip prosthesis during activities of daily living

机译：日常生活活动中双模髋关节假体的茎与颈适配器的锥度界面处的微动

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摘要

The stem-neck taper interface of bimodular hip endoprostheses bears the risk of micromotions that can result in ongoing corrosion due to removal of the passive layer and ultimately cause implant fracture. We investigated the extent of micromotions at the stem-neck interface and the seating behavior of necks of one design made from different alloys during daily activities. Modular hip prostheses (n = 36, Metha?, Aesculap AG, Germany) with neck adapters (CoCr29Mo6 or Ti6Al4V) were embedded in PMMA (ISO 7206-4) and exposed to cyclic loading with peak loads ranging from walking (Fmax = 2.3 kN) to stumbling (Fmax = 5.3 kN). Translational and rotational micromotions at the taper interface and seating characteristics during assembly and loading were determined using four eddy-current sensors. Seating during loading after implant assembly was dependent on load magnitude but not on material coupling. Micromotions in the stem-neck interface correlated positively with load levels (CoCr: 2.6-6.3 μm, Ti: 4.6-13.8 μm; p 0.001) with Ti neck adapters exhibiting significantly larger micromotions than CoCr (p 0.001). These findings explain why high body weights and activities related to higher loads could increase the risk of fretting-induced implant failures in clinical application, especially for Ti-Ti combinations. Still, the role of taper seating is not clearly understood.
机译：双模髋关节假体的茎颈锥度界面具有微动作的风险，由于去除了被动层，微动作可能导致腐蚀，最终导致植入物断裂。我们研究了一种由不同合金制成的设计在日常活动中在颈脖子界面处的微动程度以及脖子的就座行为。带有颈部适配器（CoCr29Mo6或Ti6Al4V）的模块化髋关节假体（n = 36，Metha？，Aesculap AG，德国）嵌入PMMA（ISO 7206-4）中，并承受周期性载荷，最大载荷范围为步行（Fmax = 2.3 kN） ）绊脚（Fmax = 5.3 kN）。使用四个涡流传感器确定了锥度界面处的平移和旋转微动以及组装和加载过程中的阀座特性。植入物组装后的加载过程中的位置取决于负载大小，而不取决于材料耦合。颈颈部界面的微动作与负荷水平呈正相关（CoCr：2.6-6.3μm，Ti：4.6-13.8μm; p <0.001），其中Ti颈衔接器的微动作明显大于CoCr（p <0.001）。这些发现解释了为什么高体重和与更高负荷相关的活动可能会增加在临床应用中因微动引起的植入物失败的风险，特别是对于Ti-Ti组合。仍然没有清楚地了解锥形座的作用。

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