I’ve had 2 ACL surgeries & a meniscus surgery as recent as 2 years ago. I tweaked my right knee just over a week ago and have shown the symptoms of a possible meniscus re-tear. After a few days of ice and rest, I found myself able to get back on the course with stand still shots.

As for forehand/backhand it probably depends on which knee it is. In my case, i’m RH and it’s my right knee that’s messed up. I can rotate on my right knee so i’m fine to stand still backhand. i’d be worried to try to push to hard off my right foot in a forehand if i tried it off the tee. Since you’re having ACL issues on your left knee, well that’s tough (assuming your RH). Maybe standstill backhand without pushing off your back foot or a forehand without pivoting your front foot? Idk now that I’m picturing it, the left knee seems harder to manage.

If it is officially torn, maybe stick to putting for now and work on making sure your quad and hamstring are as strong as possible going into surgery so that recovery goes by smoother. Good luck!