The first time I dislocated my knee. I was pushing my Dad's stalled truck off of the road, had my upper leg braced against the truck and my lower leg folded, in half, under the truck. Before I passed out pushed in the emergency brake. I work up about 5min later, got into the truck and drove to school (manual shifting was interesting). I walked around for about an hour until I saw my knee was about 5x the size.
Went to the health room, she told me I needed a "pass" from my 1st hour teacher. I walked about 3 football fields there, got it, walked back. Ran into my swim coach who was pissed.
I eventually got to the doc's office, had my knee drained and had surgery 2 weeks later to remove bone fragments and to try and set things right.
In the following 7 years I dislocated it 8 more times. This included when I was helping my dad lift a cemented pole out of the ground, when we were deer hunting and my foot got caught in some snow/weeds and twisted, skiing in Utah, several others, and finally just getting out of my car.
Every time I dislocated I would hear ringing in my ear, see my vision fade, my heart race, and intense pain. I'd then pass out for 5-10 minutes. The deer hunting one was fun, as my dad and brother had to half-drag me 4 miles back to the car.
2 years ago I had a patellar tendon raidiotomy, where the essentially take the tendon, remove it from the bone, shift it over, and screw it down. THe next 3 weeks were hell as I was on drugs for the pain and also intense PT for months after.
Knee injuries FTL!