I dislocated my patella almost a year ago and yesterday my patella popped out and went back. there is no pain and little swelling. can i walk again?

YES: I suggest repeat orthopedic exam and a patella knee brace.

Patella : Yes, but I think that a knee support would be a good idea for a few days. Good Luck

Common Problem: This is a common problem and more likely to recur. Strengthening quads, specifically VMO, can be helpful. For those with chronic recurrences, a surgical procedure can fix. Here is a video showing exercises: https://www.youtube.com/watch?v=_xK3VUOoezE