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首页> 外文会议>Modularity and tapers in total joint replacement devices >Metrology for Dual Taper Total Hip Arthroplasty
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Metrology for Dual Taper Total Hip Arthroplasty

机译：双锥全髋关节置换术的计量学

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Recent hip implant designs have included modular necks to offer surgeons the ability to optimally suit each patient's unique anatomy. Certain designs have experienced high rates of adverse local tissue reactions secondary to suspected corrosion at the additional modular taper of the stem-neck interface. This study used a coordinate measuring machine to determine the volumetric material loss at this interface in a single such design. Because of the unique geometry of this dual-taper design, a computational approach was developed to reverse engineer the as-manufactured geometry and report the amount of material released into the patient's joint space. Approximately 90 % of the total volume loss in the taper interface can be attributed to the male component. Volumetric cobalt-chromium-molybdenum loss rates are estimated to exceed 2.3 mm~3/year (95 % confidence interval [C.I.]: 1.67-2.96 mm~3/year) and are of similar magnitude to rates identified for material loss in metal-on-metal hips. The average rate of material loss in vivo is thus of clinical relevance in the context of the observed adverse outcomes.
机译：最近的髋关节植入物设计包括模块化的颈部，使外科医生能够最佳地适应每个患者的独特解剖结构。某些设计在柄颈界面的附加模块化锥度处由于怀疑的腐蚀而遭受了很高的不良局部组织反应。这项研究使用坐标测量机在单个此类设计中确定此界面处的体积材料损失。由于这种双锥度设计的独特几何形状，因此开发了一种计算方法来逆向工程化制造的几何形状并报告释放到患者关节腔中的材料量。锥度接口中约90％的总体积损失可归因于凸形组件。钴-铬-钼的体积损失率估计超过2.3毫米〜3 /年（95％置信区间[CI]：1.67-2.96毫米〜3 /年），其大小与金属-材料中材料损失的比率相似。金属臀部。因此，在观察到的不良后果的背景下，体内平均物质流失率具有临床意义。

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