This is an observational, cross-sectional study addressing the factors influencing treatment decisions in patients with PsA. Participants will be treated as usual in their routine clinical practice, but decisions on treatment will be recorded - whether treatment is escalated, unchanged or reduced, and why.~The study will be conducted in 25 rheumatology centres in Europe (UK, France, Germany, Spain and Italy) with five centres in each country. Each participant will only attend for one single study visit which is likely to last around 30 minutes in total. This will be alongside the participant's routine clinic visit. The PsAID-12 questionnaire will be implemented on a tablet computer but the remaining outcomes will be collected on paper CRFs and transferred to a database for analysis.
Psoriatic arthritis (PsA) is a form of inflammatory arthritis associated with the skin condition psoriasis. A variety of different treatments are used to try to control arthritis and skin psoriasis and management often involves trial and error to find the right medication for the right person. Very little is known about the decisions made to increase treatment in individual patients. Previous research in rheumatoid arthritis found that clinical measures of disease activity, patient reported outcomes and characteristics of the treating doctor all influenced the decision to change therapy in routine practice.~This investigators particularly want to establish whether routine use of the psoriatic arthritis impact of disease (PsAID-12) questionnaire in the clinic setting can enable a better understanding of the impact of PsA on each individual, improve physician-patient communication and lead to appropriate interventions. The PsAID-12 questionnaire is a relatively new European developed questionnaire measuring patient impact across 12 different domains in PsA.~This study will use routine implementation of the PsAID-12 questionnaire and see if this is related to treatment decisions and patient satisfaction. The investigators will also examine other factors that may influence treatment decisions including patient characteristics, physician characteristics, disease activity and quality of patient-physician interactions.