Yes cannabis can help. There are several ways: first, it may relieve the acute pain you are feeling day in and day out. Second, if used as a tincture or edible, can work on reducing the inflammation in that area reducing pain. Tinctures or edibles can also help you sleep better which is a common problem with people in pain. Also, depending on the cause of your arthritis (such as auto immune types) it may actually reduce the long term damage done.