Fig. 6.

(a) Anteroposterior radiograph of the left knee in a 61-year-old woman with post-total knee replacement particle disease shows geographic lucent areas of osteolysis underneath the medial base plate (white arrow) of the tibial component (T) and, to a lesser extent, the lateral base plate (arrowhead), with narrowing of the medial femorotibial compartment (black arrows), in keeping with polyethylene liner wear. (b) Coronal CT image shows cortical erosion associated with the osteolysis subtending the medial base plate (arrow) of the tibial component, and CT more clearly delineates the osteolysis surrounding the fixation screw used to secure the lateral base plate (arrowhead). Suparapatellar joint synovitis was also evident on CT (not shown).