Psoriatic arthritis criteria of Fournié et al34
| Cut-off for diagnosis of psoriatic arthritis = 11 points | |
| Criterion | Points |
| Psoriasis antedating or concomitant with joint symptom onset | 6 |
| Family history of psoriasis (if criterion 1 negative) or psoriasis post dating joint symptom onset | 3 |
| Arthritis of a distal interphalangeal joint | 3 |
| Asymmetrical monarthritis or oligoarthritis | 1 |
| Buttock pain, heel pain, spontaneous anterior chest wall pain, or diffuse inflammatory pain in the entheses | 2 |
| Radiological criterion | 5 (any one |
| Erosion of distal interphalangeal joint | criterion present) |
| Osteolysis | |
| Ankylosis | |
| Juxta-articular periostitis | |
| Phalangeal tuft resorption | |
| Human leucocyte antigen (HLA)-B16 (38, 39) or B17 | 6 |
| Negative rheumatoid factor | 4 |