hongromalacia of the patella and femoral condyle with corresponding changes to the tibial plateaus with softening of the cartilage on both of his knees.difficulties rising from a sitting position, getting up and down, particularly if he has been sitting for a long period of time.Stiffness in both knees that are aggravated by prolonged sittingUnable to move into a kneeling or squatting position.Rig