Well apparently I did.
After a night of drinking, one of my friends knocked me over and I fell on some concrete. The knee was swollen really bad and I couldn't walk on it, but the pain wasn't bad so I figured it was just a sprain, or at worst a partial tear of the mcl (happened to me a few years ago in the same knee).
I went to urgent care, got some x-rays, and they said my patella is fractured in two pieces and severely dislocated, and I might have torn a tendon as well. I have an appointment with an orthopedic surgeon tomorrow, and I'm willing to bet surgery will be necessary.
Anyone been through this before? Any advice? What should I expect? It sounds like recovery is a very lengthy process.