PT did a through exam of muscle strength, ROM and flexibility. I had two therapists watch me walk, climb stairs, go down stairs and get up and down from a sitting position (with and without using the arms of the chair).
They concluded that my left side (injured side) did not have the same strengh as my right side and this is causing me to be a little knock kneed, forcing more weight to the medial side of my left knee.
Treatment - new exercises to strengthen left hip abductor to correct the medial lean. Little things like doing a couple of leg extensions before rising from a chair if I've been sitting for awhile. I will need to be more concious of making sure my knee does not lean in - especially on stairs.
Since there is really no cure, the best we can aim for is to reduce the "wear and tear" to make the joint last as long as possible. I'm not really in pain, just occasionally discomfort.
I'll be going back to PT once a week for a while to use some special machines they have. The good news is that my current gym routine is working to maintain quad/hamstring and overall leg strength. I can also continue with the bike and my aquaerobics class.
I'll keep you posted when anything new happens.