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You can put your hands on the edge of a weight bench parallel to each other, and hold a barbell with your palms up. Let the bar roll all the way to your fingertips and then curl it back up. Then flip your palms down and grip the bar for the other side.
You can also do deadlifts and other full body workouts (hang-clean, clean and jerk, etc) but if you have arthritis it sounds like you should stay away from these as they're hard on joints and difficult for the not-so-young crowd.
Work with free-weights when doing shoulder press or bench, this will work out your stabalizer muscles and forearms which are not a factor in machine weight lifting most of the time.
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