Clinical Aspects of Psoriasic Arthritis
PsA may have different clinical forms and according to Moll and Wright, it can be:
- asymmetric: involving only one joint, e.g. the knee or one or two fingers, with dactylitis or sausage fingers. Often associated with enthesitis, i.e. tendon and bone ligament inflammation. Represents about 65% of cases.
- symmetric: a form similar to rheumatism involving fingers, toes and wrists with no Rheumatoid Factor. Represents about 17% of cases.
- main involvement of Distal Interphalangeal Joints: typically associated with psoriatic onychopathy. Represents about 10% of cases.
- spondilytic: a form associated with an inflammatory involvement of the spine and the sacred iliac joints. These aspects do not exclude one another, but are often combined. Present in about 7% of patients.
- mutilating: the most severe form as the progression of the disease leads to the erosion and deformation of small joints, often associated with pain. Occurs in about 1% of cases.