How long will i have to wait to exercise if i'm getting an arthroscopy to repair possible torn ?

10 days to 2 weeks: Swelling goes down starting day 4-5. As swelling goes down, bending improves and pain lessens. You can start light exercise when your knee swelling is mostly resolved and your pain has minimized. For many, this can be as early as 1-2 weeks. For most 2-3 weeks later this should be fine. Let pain and swelling be your guide. Once the meniscus is trimmed, internally your fine and can't hurt it.