Hi Johnny,
I am sorry to hear that. I hope you recover soon and start playing again.

Even I was a badminton player for many years, and I had to quit playing
badminton for the same reason. I tore my left ACL and meniscus during a
game, and the was the last time I played at competitions. I underwent a
surgery outside India, and they also removed a part of the meniscus as the
torn part was locking my knee. I did play again after one and half years,
but not with the same agility and confidence. And if I played for long, I
would end up with pain during the nights... but that stopped gradually over
2 years, but I never gained the same agility or confidence.

Now I seldom play badminton, and do more of cycling & swimming to keep fit.
You will need a lot of time to recover and build the muscles back, and a lot
of hard work & dedication. And based on my personal experience, don't even
try badminton/football for at least a year. Swimming helps a lot to rebuild
the muscles. Else one leg will be stronger and one leg will be weaker for
many months even after you start walking.

Assuming you have not injured your meniscus, I think you should be able to
walk soon..running, please ask your doctor. running is something my doctors
advised not to do since a part of my meniscus is missing, and I would end up
with early arthritis if I did.. For me, Swimming & Cycling are the two best
and safest of fitness activities.

How recover and how you perform now depends on your doctors, and also yuor
fitness levels before the injury.

Wish you speedy recovery.

- Murali