Psoriatic arthritis is treated with medication. In case of flares, when you have severe joint pain, your doctors could recommend corticosteroid injections into an inflamed joint to help relieve the pain. Most of you with psoriatic arthritis do not need surgery. If your disease is not well controlled, leading to joint damage, you might need joint replacement. The goal of surgery is to restore function, improve mobility and relieve pain from the affected joint.