What do u think happened to my knee?

so i do mixed martial arts, and i was grappling. My friend got me into a ankle lock on my left leg. abut as i was standing up and spinning, my knee felt like it popped out then back into place. i couldnt walk on it at first but an hour later i could, except when i bend down to pick something up, it kills or when im sitting. this just happened today, what do u suggest, it rele doesn't hurt otherwise