Among psoriasis patients, the recorded prevalence of psoriatic arthritis has varied widely due to study design. The highest prevalence has been observed in hospital-based clinic patients, reflecting a referral bias of more severe cases. In community-based psoriasis cohorts, the prevalence is much lower at <10%. In a recent community-based study using the new CASPAR (ClASsification of Psoriatic ARthritis) criteria, the cumulative 20-year incidence of psoriatic arthritis is 7.5%.[4] Forty-one percent of the arthritis cases were identified concurrently with onset of skin disease. The remainder developed arthritis at a mean of 7 years after the onset of psoriasis.[4]

BMJ Best Practice is an evidence-based point of care tool for healthcare practitioners.

To continue reading and access all of BMJ Best Practice's pages you'll need to log in or start a free trial.

You can access through your institution if your hospital, university, trust or other institution provides access to BMJ Best Practice through either OpenAthens or Shibboleth.

Use of this content is subject to our disclaimer