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首页> 外文会议>Modularity and tapers in total joint replacement devices >Validating a Simplified Method for Assessing Total Hip Arthroplasty Taper Corrosion Susceptibility with a 15-Year Retrieval Database
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Validating a Simplified Method for Assessing Total Hip Arthroplasty Taper Corrosion Susceptibility with a 15-Year Retrieval Database

机译：验证使用15年检索数据库评估全髋关节置换术锥形腐蚀易感性的简化方法

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摘要

Modular total hip arthroplasty (THA) implants allow tailoring a device to specific needs by adjusting head size, material, and offset. Modularity has recently been shown to increase risk of implant-related complications via mechanically assisted crevice corrosion (MACC). The purpose of this study was to establish a simple methodology based on existing standards to assess THA susceptibility to MACC. The method was validated by comparison to a 15-year retrieval database. CoCrMo heads were assembled onto Ti-6AI-4V stem tapers per ASTM F2009-00. The 12/14 tapers were prewet with a 1.5 pH solution. Approximately 7mL of solution was used to create a sealed acidic microenvironment. The constructs were oriented at 10° of adduction and loaded according to ASTM F2068-03. Upon completion of 10 Mcycles, constructs were disassociated per ASTM F2009-00 and taper surfaces were scored using the Goldberg method. Microscopy was performed to evaluate damage. Four linear taper scans along the taper length in four quadrants of each femoral head were taken with a profilometer. Profile deviations represented the depths of material loss. Validation was assessed by comparing scores, visual features, and material loss values of tested components to those of retrieved implants. All tapers tested exhibited corrosion damage on the stem and head tapers. Evidence of wear scars, fretting, metal transfer, and corrosion debris were found. Measurable material loss occurred on all femoral head tapers. Stem machine lines transferred to the heads were found. This study used ASTM standards to reproduce MACC in an accelerated protocol. Results were consistent with published findings and a 15-year retrieval database. This database revealed MACC on worst-case samples of commonly used head diameters (＜36mm), with higher offsets having higher corrosion scores. Due to the similarities between the qualitative and quantitative assessments of tested specimens compared to worst-case retrieved implants, test methods presented here were validated.
机译：模块化的全髋关节置换术（THA）植入物可通过调整头部尺寸，材料和偏移量来针对特定需求定制设备。最近，模块化已经显示出通过机械辅助缝隙腐蚀（MACC）会增加与植入物相关的并发症的风险。这项研究的目的是在现有标准的基础上建立一种简单的方法来评估THA对MACC的敏感性。通过与15年的检索数据库进行比较，验证了该方法。根据ASTM F2009-00，将CoCrMo磁头组装到Ti-6AI-4V杆锥上。将12/14锥度用1.5 pH溶液预湿。使用大约7mL溶液来创建密封的酸性微环境。根据ASTM F2068-03将构建体定向在10°的内加和加载。完成10个Mcycle后，根据ASTM F2009-00解除构建体关联，并使用Goldberg方法对锥度表面进行评分。进行显微镜检查以评估损伤。用轮廓仪在每个股骨头的四个象限中沿着锥度长度进行四个线性锥度扫描。轮廓偏差代表材料损失的深度。通过将分数，视觉特征和被测部件的材料损失值与取回的植入物的材料损失值进行比较来评估验证。所有测试的锥度在阀杆和头部锥度上均显示出腐蚀损坏。发现磨损痕迹，微动磨损，金属转移和腐蚀碎屑的迹象。所有股骨头锥度均发生可测量的材料损失。发现转移到头部的干线。这项研究使用ASTM标准以加速协议重现MACC。结果与已发表的发现和15年的检索数据库一致。该数据库显示了在最常用的头部直径（＜36mm）的最坏情况样品上的MACC，其偏移量越大，腐蚀得分越高。由于与最坏情况下回收的植入物相比，被测样品的定性和定量评估之间存在相似性，因此对此处介绍的测试方法进行了验证。

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