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Updated: Feb 10, 2026

Fracture Apparatus Design and Protocol Optimization for Closed-stabilized Fractures in Rodents
Published on: August 14, 2018
CT Diagnosis of Tibial Post Fracture in a Posterior-Stabilized Total Knee Arthroplasty
Alexander Cotza1, Filip Robijns2, Jan Vandevenne1,3
1Department of Radiology, Ziekenhuis Oost-Limburg, Genk, Belgium.
Abstract:
Fracture of the polyethylene tibial post is a rare complication of posterior-stabilized total knee arthroplasty and is frequently missed on conventional radiography due to the radiolucent nature of polyethylene. We report a case of post-traumatic instability in which computed tomography demonstrated a displaced polyethylene fragment with characteristic low attenuation values. The diagnosis was confirmed intraoperatively, and isolated polyethylene exchange resulted in a good clinical outcome. Teaching point: CT attenuation measurements can aid in identifying displaced polyethylene fragments and facilitate the diagnosis of tibial post fracture in posterior-stabilized knee arthroplasty.
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