sorry to hear bout your injury
. 5years ago i did my crucial ligament in my right knee. my doctor or physio couldnt diagnose what was wrong with my knee so i continued playing sports. every so often my knee would pop out of place and pop back in straight away (i know it sounds horrible) it is very pain full. a year ago i redid my knee for the 6th time but this time it was way worse that ever and i had to see a specialist. he said that it was the first time i did my knee was when i tore it and if i had got it seen to 5 years ago i would have had the problems i had. my recovery will take twice as long as a normal person. my muscles are also worn away and dont work properly. since i injured my knee everything else compensated for my injury which effected my everyday doings. i was unable to run properly, i wasnt able to hill walking (i am a very active person and i love to be on the go the whole time).
i would advise you to go for the operation. i had it nearly 5 months ago now and i have just started running ad it feels brilliant. the recovery is long but it is well worth it.
hope i have been helpful (and made sense!) and i hope your knee gets better soon
best regards :)