Stulberg S David
Northwestern University, Chicago, Illinois, USA.
Orthopedics. 2010 Sep 7;33(9):637. doi: 10.3928/01477447-20100722-51.
A dual-mobility acetabular component consists of a large, fixed, porous-coated acetabular component and a bipolar femoral component. These components are often called tripolar components. This configuration provides a stable, well-fixed implant platform against bone and 2 articular interfaces, a large polyethylene surface directly apposed to the highly polished metal shell, and a standard sized (28 mm, 32 mm) femoral head captured within polyethylene. The dual-mobility cup was designed to reduce the incidence of dislocations in patients at increased risk of instability (eg, patients undergoing revision). The cup appears to offer a safe, effective, durable solution to hip instability. The concept has extensive laboratory and clinical support. Although the long-term durability of dual-mobility cups, particularly in young, active, large patients, is not known, the tested wear rates of the dual-mobility design with the current generation of highly cross-linked polyethylene are significantly lower than any previously reported wear rates. The recently released anatomic dual-mobility cup seeks to reduce the potential for iliopsoas impingement while retaining the stability and wear characteristics of the original dual-mobility design.
双动髋臼组件由一个大的、固定的、多孔涂层髋臼组件和一个双极股骨组件组成。这些组件通常被称为三极组件。这种结构提供了一个稳定、固定良好的植入平台，与骨骼和两个关节界面相对，一个大的聚乙烯表面直接与高度抛光的金属壳贴合，以及一个标准尺寸（28毫米、32毫米）的股骨头被固定在聚乙烯内。双动髋臼杯旨在降低不稳定风险增加的患者（如翻修手术患者）的脱位发生率。该髋臼杯似乎为髋关节不稳定提供了一种安全、有效、持久的解决方案。这一概念有广泛的实验室和临床支持。尽管双动髋臼杯的长期耐用性尚不清楚，尤其是在年轻、活跃、体型较大的患者中，但当前一代高度交联聚乙烯的双动设计的测试磨损率明显低于此前报道的任何磨损率。最近推出的解剖型双动髋臼杯旨在减少髂腰肌撞击的可能性，同时保留原始双动设计的稳定性和磨损特性。
