**5. Conclusions**

we clarified the clinical features of PsA in a clinical orthopedic outpatient clinic setting. PsA was more dominant in male patients, with the osteoarticular leading type pattern of PsA observed in 17% of patients, as opposed to 75% in the skin leading type pattern. The interval between the onset of osteoarticular symptoms and the appearance of skin lesions was 4.5 years on average in the osteoarticular leading type, which was significantly shorter than that in the skin leading type. It was concluded that for patients with RF negative polyarthritis, it is important to be aware that psoriasis may develop approximately 4 years on average. Increased use of csDMARDs and bDMARDs was observed compared to that of NSAIDs.
