You can work with a physical therapist to strengthen the muscles around the joint, stabilize the joint, and improve your range of motion. The therapist will use techniques such as ultrasound, heat or cold therapy, electrical nerve stimulation, and manipulation.
If you are overweight, losing weight can relieve some of the pressure on your painful joints. Exercise is one effective way to lose weight (along with diet), but be careful to stick with low-impact exercises that won't further irritate the joint. Swimming and bicycling are among the best exercises because both allow you to exercise your joints without putting impact on them. Because water is buoyant, swimming also relieves some of the pressure on your joints.