Figure 1
CT images displayed in a soft‑tissue window demonstrating a displaced polyethylene tibial post fragment (blue arrows).
(a) Sagittal image showing region‑of‑interest measurements within the displaced fragment and the intact tibial insert, revealing similar low attenuation values (approximately −86 HU), consistent with polyethylene.
(b) Axial image demonstrating the well‑defined displaced fragment in the lateral suprapatellar region.
Figure 2
Retrieved polyethylene tibial insert demonstrating fracture of the tibial post, which was confirmed intraoperatively during revision surgery.