this probaly doesnt help but my knees are horrible. Girls are known to have weak knees but, my knee locks up and i cant move it until i brace my self for my knee to pop back in. It HURTS!
I looked up somthing online
and here was the question

"What is a ligament tear in the knee How long do you need for it to heal from the day it was torn if there was a pop Is the best treatment to have it held in place tied together until the pop is gone? "

ANswer:
"If you have a tear in a ligament it is called a sprain. Sprains come in different degrees depending on how much is torn. A mild sprain can be treated with RICE (Rest Ice Compression and Elevation).

If you heard a pop, then most likely you suffered a dislocation. That is more severe because it involves a forceful separation of a joint and more severe tearing of ligaments with possible damage to the joint capsule. I am not sure how you are keeping it tied together, but anytime there is a possibility of a dislocation or a break there is usually loss of function in the joint, or the nearest joint if it is a break.

The best thing to do if you hear a pop, since it could be a dislocation or a break, is to get it x-rayed and checked out by a doctor. "
HOPE I HELPED

oh btw, im not saying that your a girl, i was just saying