Ciatti Corrado, Andriollo Luca, Pisanu Francesco, Masoni Virginia, Bori Edoardo, Quattrini Fabrizio
University of Parma, Italy; Orthopaedics and Traumatology Department, Guglielmo da Saliceto Hospital, AUSL Piacenza, Italy.
Ortopedia e Traumatologia, Fondazione Poliambulanza, Brescia, Italy; Università Cattolica del Sacro Cuore, Italy; Alma Mater Europea University, Vienna, Austria.
Int J Surg Case Rep. 2025 Jul;132:111473. doi: 10.1016/j.ijscr.2025.111473. Epub 2025 Jun 3.
While MoM tribology gained popularity in the late 20th and early 21st centuries mainly due to the low wear rates and excellent durability, in the following years, it has been the cause of many implant failures due to adverse reactions to metal debris (ARMD) of different entities.
We presented the case of a 61 years old female with failure of a metal-on-metal (MoM) THA, due to an improper positioning of the cup. The excessive verticality of the component generated the failure.
Since acetabular cup orientation is one of the most critical factors influencing the performance and longevity of MoM total hip prostheses, this study highlights how incorrect cup orientation can cause a negative and sometimes catastrophic outcome, necessitating revision.
The precise acetabular cup positioning in MoM hip prosthesis geometry is essential in preventing functional overloading, release of metal ions and adverse tissue reactions. When evaluating patients with metal-on-metal hip prostheses, it is necessary to consider the orientation of the cup as a predictive factor for failure and wear of the components.
金属对金属（MoM）摩擦学在20世纪末和21世纪初广受欢迎，主要是因为其低磨损率和出色的耐久性，但在随后的几年里，由于对不同类型金属碎屑的不良反应（ARMD），它已成为许多植入物失败的原因。
我们报告了一例61岁女性金属对金属全髋关节置换术（MoM THA）失败的病例，原因是髋臼杯位置不当。部件过度垂直导致了失败。
由于髋臼杯的方向是影响金属对金属全髋关节假体性能和使用寿命的最关键因素之一，本研究强调了杯方向不正确如何会导致负面甚至灾难性后果，从而需要进行翻修。
在金属对金属髋关节假体几何结构中，精确的髋臼杯定位对于防止功能过载、金属离子释放和不良组织反应至关重要。在评估金属对金属髋关节假体患者时，有必要将杯的方向视为部件失败和磨损的预测因素。
