On Saturday evening I stepped wrong and something popped in the back of my knee joint and I couldn't walk it hurt really bad. On Sunday morning I had to use a cane to walk but it hurt to bend that leg. I iced it and kept it elevated as much as possible. At 630 am this morning i woke up and it felt like the inside of my knee was on fire and the back of my knee was very red. I took some Tylenol arthritis and the burning and redness went away but it kinda scared me.