Most people with psoriatic arthritis will never need surgery. But when nothing else has worked, surgery can relieve pain, help an affected joint work, and allow you to move more. A procedure called synovectomy removes the diseased lining of a joint. If the damage is very bad, you may need surgery to replace your joint, called arthroplasty. When a joint can't easily be replaced, joint fusion might make it stronger, more stable, and less painful.