ut)HLA tissue typing (to look for genetic markers in ankylosing spondylitis)Skin biopsy (to diagnose a type of arthritis that involves the skin, such as lupus or psoriatic arthritis)Muscle biopsy (to diagnose arthritis or rheumatic diseases, such as polymyositis or vasculitis) Rehabilitation for arthritisAn arthritis rehabilitation program is designed to meet the needs of the individual patient, d