Hi everyone-- have a 44 year old, 6 time surgeried rt knee (torn cart, debris removal, acl replace, tighten, etc.,) question is -- Has anyone ever experienced terrible pain and locking while sleeping? Seems ridiculous that while I am asleep, (on stomach) I frequently wake up in pain as bad knee is sort of locked and in pain until I move it, then pain fades away, and knee is pretty much fine the next morning. Have just had MRI, which confirms no new tears or damage, but am having occasional locking and pain. Any help is appreciated!