Clinical and imaging characterisation of patients with PsO prior to PsA onset
| Positive association with PsA development | No association with PsA development | |
| Pain | 4 studies (PsO=667; incident PsA=99) | 0 |
| Joint tenderness | 3 studies (PsO=257; incident PsA=42) | 0 |
| Arthralgia | 4 studies (1 study only in female)* (PsO=667; incident PsA=99) | 1 study (in male)* (PsO=410; incident PsA=57) |
| Subclinical enthesopathy (US in 2 studies, pQCT) | 3 studies (PsO=325; incident PsA=39) | 0 |
| Subclinical synovitis (US or MRI) | 1 study (PsO=109; incident PsA=9) | 2 studies (PsO=143; incident PsA=18) |
| Subclinical tenosynovitis (US or MRI) | 0 | 2 studies (PsO=143; incident PsA=18) |
*The definition of arthralgia used in these studies were different: in Faustini et al, this was the presence of at least one tender joints; in Zabotti et al, it was recent onset of non-inflammatory joint and/or entheseal pai and in Simon et al in terms of VAS and tender joints.
pQCT, peripheral quantitative tomography; PsA, psoriatic arthritis; PsO, psoriasis; US, ultrasonography.