Tricky. The answer depends a lot on what kind of injury, where you are in the healing process, etc. I hope you had your injury checked out medically so you know what the medical & physical therapy recommendations are. That will help you figure out what you need to do.
My story (short version LOL) is that I lost cartilege in one knee years ago because of an accident; through PT, walking, and yoga got back full range of motion and no pain until (decades later) arthritis appeared. Now I am doing lots of seated leg extensions, which is slowly creating stability and reducing pain in the knee. I have gotten to the point where I can do Warrior series, but very carefully, with a chair nearby in case I need it for support.
Just as a lot of "Healthy Back" classes are really designed to help people prevent, rather than heal, back issues, a lot of the asanas that are recommended for knee strengthening (warrior series, anything involving squatting) are good for strengthening healthy knees.
I'd recommend that you seek advice from a physical therapist, or a yoga teacher who has a PT background or has been trained in yoga therapy.
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