Since you have damaged ACL, MC and MM, you should avoid knee exercises which need you to flex the knee.
Static exercises would benefit you the most. Exercises should be done for all the muscle around the knee. I suggest following exercises.
1) Knee press: keep pillow beneath the knee and press it by the knee. Hold it for 5 sec, repeat it for as many numbers as you can.
2) Straight leg raise.
3) Straight leg raise in side lying.
Hope this helps you. best wishes.
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