Fracture of the polyethylene tibial post in the posterior-stabilized total knee prosthesis: arthrographic and CT arthrographic diagnosis
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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.
KeywordsTotal knee arthroplasty Posterior-stabilized design Tibial post fracture CT arthrography
We would like to acknowledge the surgical team in the Department of Orthopedics of the Chi Mei Medical Center for their input in discussion of arthroscopic and operative results. We are also grateful to Chen Hsu, who illustrated the figure for our manuscript.
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Conflict of interest
The authors declare that they have no conflict of interest.