Here is a photo of what the doctor thinks what happened.  The ACL is torn, and the “popping” was the avulsion -the twinsting of the bone because the ACL couldn’t hold it in place.  The sweet thing is it “twisted” 3 times that night. 

Anywho…unless I want the keep letting my bones twist when they feel like it, surgury is a must. 

The doc also said that there was a weird bone fragment showing up on the xray they took at the ER.  He hasn’t EVER seen a bone fragment in this location so there may be other weirdness going on there.