Patellar tracking and flexion space balancing using a femoral component with asymmetrical femoral condyles

Using a neutrally positioned femoral component with asymmetrical posterior condyles (Genesis II), we were able to balance the flexion space without having to externally rotate the implant in the total knee patient. This avoided the problems with external rotation including incongruency in extension, femoral notching and trochlear overhang. Three percent of the patients required a lateral release. Patellar shift and patellar tracking were proper in over 95% of cases. The incidence of anterior knee pain was only 2%. The lateral release rate and the residual anterior knee pain we observed are lower than those reported in other published literature.