There are 5 types of psoriatic arthritis and some overlap:symmetric arthritis affects the same joints on each side of your body-you're likely to have symptoms in several joints; asymmetric arthritis affects different joints on each side of your body, eg a few finger joints and a knee joint; distal interphalangeal predominant(DIP) arthritis happens in the joints closest to your fingernails and toenails; arthritis mutilans leads to serious deformity in your fingers and toes and can also affect your spine; spondylitis-the arthritis develops in your spine and you will have pain and stiffness in your back and neck.
Attribution: BUPA