First visit to the PT yesterday. After a few movements to give her a view of my knee and leg, the PT determined that my knee problem is likely caused by a weak and inflexible set of Gluteus Medius and Minimus. When stepping up and down on a stool, my right knee tracks in, rather than staying straight. By working my glutes I should be able to stabilze the knee as it moves back and forth.
Two sessions a week for a while. Fingers and toes crossed.