Fig. 3.

(a) Coronal CT image of the left knee in a 72-year-old woman with post-total knee replacement aseptic loosening shows a focal periprosthetic lucency (white arrow) underlying the lateral base plate of the tibial component, which is in keeping with early loosening, and mild asymmetric narrowing of the lateral femorotibial joint space suggestive of early polyethylene liner wear (black arrows). (b) Follow-up CT image taken 18 months later shows interval progression of prosthesis loosening and liner wear, as seen by increased periprosthetic lucency (arrowheads) and further reduction in the lateral femorotibial joint space (black arrows).