Fig. 2
From: Influence of Patella thickness on Patellofemoral pressure in total knee Arthroplasty
a Frontal view and (b) lateral view of a custom-made femoral component with a built-in pressure sensor (white arrow). c An adjustable thickness patellar component was composed of the base part (white arrow) and the patella part (black arrow). d The base part (white arrow) was fixed on a patella with k-wires, then a patella thickness was adjusted by rotating a screw hole of the patella part (black arrow)