I'll let my DW (Tazicket) chime in more, but she had knee cap problems after dislocating it in high school and a few years ago had to have patellar realignment surgery done. It wasn't fun. At least she can walk now. It had gotten to the point where walking, squatting, stairs, etc. were all very painfull - we even had to have her in a wheelchair at WDW on year because the walking was causing so much pain - she got the surgery a couple of months later. Recovery was a bear. Hope yours turns out not as a bad.
DW chiming in.
My problem evidently happened because my patellar tendons are anchored in the wrong place (they're too far towards the outside of my legs). After I dislocated my kneecap, things never really fully healed, but I didn't find this out until a few years later. Something to do with my Quad muscle in that leg never getting used because of the way everything was anchored.
I was having a lot of pain, clicking and popping, and the knee would just randomly give out. I was referred to an Orthopedic surgeon who looked at it and sent me home with crutches and a list of exersizes to try for 2 or 3 weeks. The knee didn't get any better and all the crutches really did was irritate me.

I went back after the 2 or 3 weeks and, since nothing had improved, we opted for surgery a week later.
They moved the anchor point of my patellar tendon in my bad leg over to where it should have been anchored all along and screwed it in. I had a cast from my toes up to mid-thigh for about 6 weeks and then did PT for about 3 months (I think). After the cast came off, I had a wheelchair and a walker that I used to get around for a couple of months and then came off the walker and went to a cane for a month or two. (I'm super clutzy and always had a lot of trouble any time I tried to use crutches.)
Like DH said, my recovery was really tough. But, my knee was
really screwed up to begin with. I still have clicking and popping and it will ache periodically, but it's nowhere near as bad as it was before my knee surgery. It just took a long time to get to this point. Then again, I'm a really huge wimp.
Hope your knee feels better soon! And, if you do need surgery, please take my experience with a grain of salt - everybody is different.
