Inclusion Criteria:  PsA patients according to the CASPAR criteria who consecutively applied to the FTR outpatient clinic for PsA follow-up and healthy volunteers who applied to the FTR outpatient clinic enrolled in the study.  Exclusion Criteria:  Patients were excluded from the study if they had history of conditions associated with an increased incidence of CTS except PsA (diabetes mellitus, pregnancy, hypothyroidism, renal failure or other severe systemic diseases); history or clinical/electrophyscologic finding of radiculopathy, plexopathy, polyneuropathy or any nervous system diseases; history of fractures, severe trauma or surgical interventions involving the wrist; bifid median nerve on wrist imaging and under the age of 18, over the age of 65. There was no history of rheumatic disease in the healthy volunteer group.