Stony Brook University Orthopaedics, Setauket, NY, USA.
J Arthroplasty. 2011 Apr;26(3):505.e13-5. doi: 10.1016/j.arth.2010.01.004. Epub 2010 Mar 23.
Determining the etiology of a painful knee after arthroplasty can be extremely challenging. Traditionally, orthopedists relied mainly on physical examination, laboratory results, serial radiographs, and 3-phase bone or indium-labeled white blood cell scans; however, recent advances in magnetic resonance imaging (MRI) software have given orthopedists another powerful tool in their diagnostic armamentarium. We provide the MRI software modification technique for metallic artifact reduction as well as present a novel case in which MRI was used to diagnose catastrophic polyethylene postfailure in a posterior cruciate ligament substituting knee. Although the role for MRI in the postarthroplasty knee has yet to be clearly defined, its utility in working up a painful arthroplasty when history, physical examination, and other diagnostic utilities fail to provide answers is clearly demonstrated in this case.
确定关节置换术后膝关节疼痛的病因极具挑战性。传统上，骨科医生主要依赖体格检查、实验室结果、连续 X 线片和三相骨或铟标记白细胞扫描；然而，磁共振成像 (MRI) 软件的最新进展为骨科医生的诊断工具提供了另一种强大的工具。我们提供了用于减少金属伪影的 MRI 软件修改技术，并介绍了一个新的病例，即 MRI 用于诊断后交叉韧带替代膝关节中灾难性聚乙烯后失效。尽管 MRI 在关节置换术后膝关节中的作用尚未明确界定，但在病史、体格检查和其他诊断方法均无法提供答案的情况下，该病例清楚地表明了 MRI 在治疗疼痛性关节置换方面的效用。
