Manson Theodore T, Adrados Murillo, Gililland Jeremy M, Mahmood Bilal M, Samuel Linsen T, Moskal Joseph T
Department of Orthopaedic Surgery, University of Maryland, Baltimore, Maryland.
Department of Orthopaedic Surgery, Virginia Tech Carilion School of Medicine, Roanoke, Virginia.
J Bone Joint Surg Am. 2023 Feb 1;105(3):250-261. doi: 10.2106/JBJS.22.00185. Epub 2022 Dec 6.
➤: Dual mobility (DM) refers to a now widely available option for total hip articulation. DM implants feature a small inner head, a hard bearing, that connects via a taper fit onto the femoral trunnion. This head freely rotates but is encased inside a larger, outer polyethylene head that articulates with a smooth acetabular component.
➤: DM acetabular components are available in the form of a monoblock shell or as a liner that is impacted into a modular shell, providing a metal articulation for the polyethylene outer head.
➤: DM is designed to increase hip stability by providing the arthroplasty construct with a higher jump distance, head-to-neck ratio, and range of motion prior to impingement.
➤: The use of DM in total hip arthroplasty continues to increase in the United States for both primary and revision arthroplasty. Surgeons should be aware of the potential benefits and pitfalls.
➤: Long-term data are lacking, especially for modular DM implants. Points of concern include a potential for accelerated polyethylene wear, intraprosthetic dislocation, and modular backside fretting corrosion.
➤：双动（DM）是指目前广泛应用于全髋关节置换的一种选择。DM植入物的特点是有一个小的内股骨头，采用硬轴承，通过锥度配合连接到股骨柄上。这个股骨头可自由旋转，但被包裹在一个较大的聚乙烯外股骨头内，该外股骨头与光滑的髋臼部件形成关节。
➤：DM髋臼部件有整体式髋臼杯或内衬两种形式，内衬被压入模块化髋臼杯中，为聚乙烯外股骨头提供金属关节。
➤：DM的设计目的是通过为关节置换结构提供更高的跳跃距离、头颈比和撞击前的活动范围，来提高髋关节的稳定性。
➤：在美国，DM在初次和翻修全髋关节置换术中的使用持续增加。外科医生应了解其潜在的益处和风险。
➤：缺乏长期数据，特别是关于模块化DM植入物的数据。值得关注的问题包括聚乙烯磨损加速、假体内部脱位以及模块化部件背面微动腐蚀的可能性。
