解剖型钛合金柄灾难性耳轴失效
Catastrophic Trunnion Failure in an Anatomic Titanium Alloy Stem.
作者信息
Pruitt Benjamin P, Mears Simon C, Apple Andrew E, Stambough Jeffrey B, Barnes C Lowry, Stronach Benjamin M
机构信息
Department of Orthopaedic Surgery, University of Arkansas for Medical Sciences, Little Rock, AR, USA.
Department of Orthopaedic Surgery, Tulane University School of Medicine, New Orleans, LA, USA.
出版信息
Geriatr Orthop Surg Rehabil. 2022 Nov 28;13:21514593221142726. doi: 10.1177/21514593221142726. eCollection 2022.
INTRODUCTION
Certain titanium alloy stems have been shown to be susceptible to failure at the neck with catastrophic trunnion failure. Failure has been particularly noted in the single wedge Accolade 1 stem design. Other stems also used this alloy including the anatomic designed Citation stem.
METHODS
This case series details 3 catastrophic failures of the TMZF version of the Citation femoral stem.
RESULTS
Each of these failures appear to be attributed to cyclical wear of the TMZF trunnion against the cobalt chromium femoral head. Wear resulted in ultimate implant failure and significant metal debris in the joint capsule at the time of revision surgery.
DISCUSSION
While surgeons are aware of the risk of catastrophic failure for the Accolade 1 stem, failure may similarly happen in the TMZF Citation stem. Surgeons should monitor these implants with care and discuss the potential for trunnion failure with their patients.
引言
某些钛合金柄已被证明在颈部易发生灾难性耳轴失效故障。这种故障在单楔Accolade 1柄设计中尤为明显。其他柄也使用了这种合金，包括解剖学设计的Citation柄。
方法
本病例系列详细介绍了Citation股骨柄TMZF版本的3例灾难性故障。
结果
这些故障中的每一例似乎都归因于TMZF耳轴与钴铬股骨头之间的周期性磨损。磨损导致最终植入物失效，并在翻修手术时在关节囊中产生大量金属碎屑。
讨论
虽然外科医生意识到Accolade 1柄存在灾难性故障的风险，但TMZF Citation柄同样可能发生故障。外科医生应仔细监测这些植入物，并与患者讨论耳轴失效的可能性。
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