Table 3.

Summary of the results obtained in the reference condition

PF kinematic motion component	Traditional femoral component	Patella-friendly femoral component
	Patellar excursion	Patellar excursion
Flexion–extension rotation	Similar to native	Similar to native
Varus–valgus rotation	Higher patellar excursion than native	Similar to native
Internal–external tilt	Similar to native	Similar to native
Anterior–posterior translation	Similar to native	Similar to native
Proximal–distal translation	Similar to native	Similar to native
Medial–lateral translation	Greater overall translation; more lateral patella than native in full flexion	Similar range of motion; patella more medially translated than native throughout the flexion knee