Implant Research Center, Drexel University, Philadelphia, Pennsylvania.
J Arthroplasty. 2013 Sep;28(8 Suppl):2-6. doi: 10.1016/j.arth.2013.05.040. Epub 2013 Aug 1.
This retrieval study documents taper damage at modular interfaces in retrieved MOM THA systems and investigates if increased modularity is associated with increased fretting and corrosion. One hundred thirty-four (134) heads and 60 stems (41 modular necks) of 8 different bearing designs (5 manufacturers) were analyzed. Damage at the shell-liner interface of 18 modular CoCr acetabular liners and the corresponding 11 acetabular shells was also evaluated. The results of this study support the hypothesis that fretting and corrosion damage occurs at a variety of modular component interfaces in contemporary MOM THAs. We also found that modularity of the femoral stem was associated with increased damage at the head. An analysis of component and patient variables revealed that dissimilar alloy pairing, larger head sizes, increased medio-lateral offsets and longer neck moment arms were all associated with increased taper damage at the modular interfaces.
这项检索研究记录了 MOMTHA 系统中模块化接口处的锥形磨损情况，并研究了增加模块化是否与更多的微动和腐蚀有关。分析了 8 种不同设计（5 家制造商）的 134 个头和 60 个柄（41 个模块化颈部）。还评估了 18 个模块化 CoCr 髋臼衬里和相应的 11 个髋臼外壳在壳衬界面处的损伤。这项研究的结果支持这样一种假设，即在当代 MOMTHA 中的各种模块化组件接口处会发生微动和腐蚀损伤。我们还发现，股骨柄的模块化与头部的更大损伤有关。对组件和患者变量的分析表明，不同合金配对、更大的头部尺寸、更大的内外侧偏移量和更长的颈部力矩臂都与模块化接口处的锥形磨损增加有关。
