Exercises to strengthen your knee

You should get a diagnosis before asking for exercise options. What injury you have dictates what exercise you can do without further damaging your knee. Best thing to do is to rest it and use ice to reduce any swelling you may have.

You can’t “strengthen the knee”. You can only strengthen the muscles that support it. Different muscles support different functions and until you find out what the exact issue is, there’s no way to really determine what needs to be strengthened.

From my own (torn ACL and MCL) experience, however, I can advise you to generally to avoid any sort of open chain exercises. I can squat all day, but even light weight on some kunty machine like leg extension or curls will hurt like a MFer.

RICE the knee

Rest
Ice
Compression
Elevation