well i tore my MCL and meniscus about a year ago.
My ankle got huge and purple for a week aswell.
had mensicus surgery they sewed it back on. left my MCL alone. grade 2/3 tear.
i notice my tib fib on that side is definitely twisted inwards more than the other.
This problem happens with both legs, but is worse on my torn knee.
strecthing has helped alot but it still snaps.
if i work out too hard, i get a painful stinging sensation on the inside of my knee that lasts for weeks. happens randomly.