Department of Medical Imaging, Chi Mei Medical Center, Yongkang, No. 901, Zhonghua Rd Yongkang District, Tainan City, 71004, Taiwan.
Department of Medical Imaging, Chi Mei Medical Center, Chiali, No. 606, Jialixing Xinghua Village, Jiali District, Tainan City, 72263, Taiwan.
Skeletal Radiol. 2019 Jul;48(7):1145-1148. doi: 10.1007/s00256-019-03173-5. Epub 2019 Feb 7.
Fracture of the polyethylene tibial post in the posterior-stabilized total knee prosthesis is often delayed in diagnosis due to its nonspecific symptoms and the radiolucent characteristic of polyethylene on conventional radiography. Therefore, the diagnosis is always established by arthroscopy. Notwithstanding recent advances in imaging modalities, we are presently aware of only two related case reports on MRI and even no reports about arthrographic or CT-arthrographic diagnosis of fractured tibial post. We hereby report a case of a 58-year-old female patient who developed recurrent knee pain during the third year after total knee arthroplasty. The displaced polyethylene tibial post was clearly outlined by administered contrast material in the posterior knee. Under the diagnosis of fracture of the tibial post, the patient underwent isolated replacement of the broken polyethylene insert. Her knee pain significantly improved after the operation.
后稳定型全膝关节假体的聚乙烯胫骨托骨折由于其非特异性症状和常规 X 线摄影中聚乙烯的不透射线特性，常常延误诊断。因此，诊断通常通过关节镜确定。尽管影像学技术有了最近的进展，但我们目前仅了解到两篇关于 MRI 的相关病例报告，甚至没有关于关节造影或 CT 关节造影诊断胫骨托骨折的报告。我们在此报告一例 58 岁女性患者，在全膝关节置换术后第三年出现反复膝关节疼痛。关节内注射对比剂后，明显勾勒出移位的聚乙烯胫骨托。根据胫骨托骨折的诊断，患者接受了单独的破损聚乙烯插入物置换。术后患者的膝关节疼痛明显改善。
