Yep. I've got a "weather knee" too.

I broke it the first time skiing, tearing off all the ligaments, tendons, pulverizing the knee cap, etc. Then ten years later broke it again in the same place, when a rottweiller I was walking decided to make a sharp right turn while walking on my left on a leash. The doctor said my knee was "pulp" and that "everything that is supposed to be solid is semi-liquid." NOT what you want hear!

My knee is a MUCH better predictor of upcoming cold fronts, storms and changes in barametric pressure than any weather forecaster on TV! Maybe I should get a new career ....