What kind of knee injury?

I slipped on a wet floor and both legs went out in front of me. I immediately had sharp pain on the medial inner side of my right knee going up to the center of the knee. Pain has persisted on walking, any kind of twisting or side to side motion, and especially straightening the knee, which hurts the most. Pain/burning and swelling is worst in the morning. I took an MRI but won't have my results back for several more days. I am taking Advil and ice packs.
What kind of injury does this sound like? I'd like to know from your experience what you think I injured.
Thanks
D