I think it is at this stage of your recovery (5 months) that a lot of the things we do in PT finally become appropriate. Earlier, it is too much on our knees to do some of the strengthening exercises. One of my knees is the same age as yours, and the other is a babe in the woods at 10 weeks. Recently I have been going to PT once a week. Will go two more times. Then moving over to the gym. Have used these sessions to ask loads of questions about strengthening exercises I can do on the machines at the gym. PT will cost me too much after the new year, when my deductible starts over, so I'm soaking it all up now.