There are a lot of
exercises you can do, even with ligament injuries; I suffered from one for many years before finally having surgery to correct it.
If you can let us know where the injury is, we might be able to suggest exercises you can do; but no matter what your physical abilities are, you can always do yoga. There are yoga exercises for all abilities, even those who are in wheelchairs. Yep, I just, today, received a DVD of Yoga for Seniors, and some of them are in wheelchairs.