Anterior Subluxation of a Metal-on-Metal Total Hip Arthroplasty Resulting in Erosion and Metal Debris.

IF 0.4 Q4 ORTHOPEDICS
Case Reports in Orthopedics Pub Date : 2025-02-20 eCollection Date: 2025-01-01 DOI:10.1155/cro/3718607
Connor Park, Jens Verhey, Roman Austin, Daniel Howgate, Abhijith Bathini, Mark K Lyons, Joshua S Bingham
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Abstract

Introduction: Total hip arthroplasty (THA) is a commonly performed and highly successful surgical procedure. Metal-on-metal (MoM) THA implants were introduced two decades ago and subsequently recalled due to high early revision rates. Acetabular cup erosion and fragmentation secondary to chronic edge loading causing delayed instability are rare but devastating complications of MoM THA warranting expeditious revision surgery. Case Presentation: We report a 70-year-old male with a history of bilateral MoM THA who presented with left hip instability. In addition to the radiographic and clinical features of hip instability, macroscopic examination at revision surgery revealed extensive erosion and fragmentation of the antero-superior margin of the implanted cup, osteolysis, and widespread metallosis of the periarticular soft tissues. Discussion: This case highlights a significant adverse complication of MoM THA. Despite the industry's wide discontinuation and recall of these implants, MoM hip arthroplasty implants are present in many patients, who are all at risk of developing similar complications. Guidelines for the surveillance and treatment of both symptomatic and asymptomatic MoM THAs have been reported, although ambiguity remains in the optimal approach for managing patients with existing MoM THA. Conclusion: Failure of MoM hip arthroplasty is most commonly the result of adverse reaction to metal debris. We present a novel mechanism of failure in a patient presenting with late instability due to asymmetric wear of the MoM bearing surface.. While it is uncertain whether early intervention in this patient may have prevented this complication, arthroplasty surgeons should be aware of the various modes of failure for MoM hip implants, as expeditious revision surgery is often required.

金属对金属全髋关节置换术前路半脱位导致糜烂和金属碎片。
全髋关节置换术(THA)是一种常见且非常成功的外科手术。金属对金属(MoM) THA植入物在20年前引入,随后由于早期翻修率高而被召回。髋臼杯糜烂和骨折继发于慢性边缘负荷导致迟发性不稳定是罕见的,但毁灭性的并发症需要快速翻修手术。病例介绍:我们报告一位70岁男性,有双侧MoM THA病史,表现为左髋关节不稳定。除了髋关节不稳定的影像学和临床特征外,翻修手术时的宏观检查显示植入杯前上缘广泛糜烂和碎裂,骨溶解,关节周围软组织广泛金属化。讨论:本病例强调了MoM THA的一个重要的不良并发症。尽管业界广泛停止和召回这些植入物,MoM髋关节置换术植入物存在于许多患者中,他们都有发生类似并发症的风险。有报道了有症状和无症状MoM THA的监测和治疗指南,尽管对于现有MoM THA患者的最佳治疗方法仍然不明确。结论:MoM髋关节置换术失败最常见的原因是金属碎片的不良反应。我们提出了一种新的失败机制,在病人表现出晚期不稳定,由于不对称磨损的MoM承载表面。虽然尚不确定该患者的早期干预是否可以预防这种并发症,但关节置换外科医生应该意识到MoM髋关节植入物的各种失败模式,因为通常需要快速翻修手术。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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