What happened to me just now?

I was sitting cross-legged, and attempted to uncross my legs and sit straight. I moved the leg on top down, and I felt something in my left knee move, following with excruciating pain when I started to move my left leg. I was attempting to move my leg in a more comfortable position to comfort the pain, so I lifted my left leg, felt a crack, and the pain was gone. What just happened? (Side note: I have Chondromalacia if that helps)

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