@Josephine, why would that pop up after all this time? It's 2½ years since my surgery.

Absolutely, nothing different. I washed clothes and cleaned the few gifts from out under the Christmas tree. Just computer work after that.What activities did you do?
No, it’s not any better.Has your knee calmed down any? You have that new, lower deductible now, so you can see about it if you want to!

I will try but it’s very upset with me for inviting this trauma to happen to it. I’m pretty upset with me, too, for the same reason.Tell that knee of yours to behave!
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United KingdomSure! Here is a picture of the knee under the skin. You can see that the patella is surrounded by a number of ligaments whose job it is to keep the patella in place. The one concerned here is that sneaky little tendon peaking out called the Lateral retinaculum. In the second image, it shows how, when the lateral retinaculum becomes tight or the medial one gets slack, it can cause the patella to be out of alignment to where it should be.
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The surgeon will approach this via arthroscopy which will just leave you with a couple of little 'stab' wounds.
He looks inside the knee using the camera and an instrument. Water is used to inflate the joint so he can see what he's doing! He then approaches the retinaculum from inside and makes a small cut in the centre to make it slack off.
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Pain after this is minimal but there will be some, mostly from the knee being inflated, some from the cut in the retiniculum and a little from the skin incisions. This should all be well controlled with paracetamol/Tylenol but you should take adequate doses, being 1,000mgs 4 times a day at 6hrly intervals.
Also, weight bearing and activity should be pretty normal though you might find a couple of crutches helpful for the first few days.