Comparison between patients wih PsA with radiographic and nonradiographic sacroiliitis.
| Radiographic Sacroiliitis | Nonradiographic Sacroiliitis | P | |
|---|---|---|---|
| Patients, n | 29 | 11 | - |
| Sex, female, n (%) | 10 (34.5) | 4 (36) | > 0.999 |
| Age, yrs | 52.5 (12.2) | 47.6 (9.9) | 0.25 |
| BMI, kg/m2 | 25.9 (5.8) | 26.3 (5.4) | 0.84 |
| Active smoking status, n (%) | 1 (3.4) | 1 (9.1) | 0.62 |
| Fibromyalgia, n (%) | 2 (6.9) | 0 (0.0) | 0.94 |
| PsO duration, yrs | 23.8 (12.5) | 14.1 (11.7) | 0.03 |
| PsA duration, yrs | 12.3 (9.8) | 4.7 (4.5) | 0.02 |
| Tender joint count | 5.6 (8.9) | 3.6 (4.7) | 0.47 |
| Swollen joint count | 0.9 (1.6) | 0.9 (1.5) | 0.93 |
| CRP, mg/L | 8.7 (9.4) | 7.1 (7.8) | 0.62 |
| DAPSA | 15.1 (12.5) | 14.2 (7.2) | 0.84 |
| LEI | 0.7 (0.9) | 0.6 (0.8) | 0.56 |
| MASES | 0.9 (1.9) | 0.3 (0.7) | 0.39 |
| Dactylitis, n (%) | 6 (20.7) | 3 (27.2) | 0.74 |
| PASI | 8.2 (14.3) | 2 (2.6) | 0.17 |
| Low back prevalence, n (%) | 21 (72.4) | 8 (72.7) | > 0.999 |
| IBP prevalence, n (%) | 13 (46.4) | 3 (27.3) | 0.52 |
| Back pain intensity (patient VAS 0–10) | 3.0 (3.0) | 2.5 (3.1) | 0.59 |
| BASDAI | 3.5 (2.5) | 4.3 (1.9) | 0.34 |
| ASDAS-CRP | 2.1 (1.1) | 2.3 (0.8) | 0.71 |
| BASMI | 3.2 (1.4) | 2.2 (0.9) | 0.05 |
| BASFI | 2.9 (2.3) | 2.4 (2.1) | 0.52 |
| Current medication use, n (%) | |||
| Current sDMARD treatment | 8 (27.6) | 6 (54.5) | 0.22 |
| Current biologic treatment | 14 (48.3) | 2 (18.2) | 0.17 |
| MRI SIJ scores | |||
| Total Berlin score | 17.5 (13.1) | 8.5 (7.7) | 0.04 |
| Osteitis/BME (0–24) | 3.7 (4.7) | 4.2 (3.3) | 0.75 |
| Fat infiltration score (0–24) | 4 (5.5) | 0.1 (0.3) | 0.02 |
| Erosion score (0–24) | 7.9 (7.8) | 3.5 (3.6) | 0.08 |
| Sclerosis score (0–8) | 0.8 (1.6) | 0.8 (1.6) | 0.48 |
| Ankylosis score (0–8) | 1.1 (2.6) | 0 (0) | 0.09 |
Values are expressed as mean (SD) unless otherwise stated. ASDAS: Ankylosing Spondylitis Disease Activity Score; BASDAI: Bath Ankylosing Spondylitis Disease Activity Index; BASFI: Bath Ankylosing Spondylitis Functional Index; BASMI: Bath Ankylosing Spondylitis Metrology Index; BME: bone marrow edema; CRP: C-reactive protein; DAPSA: Disease Activity Index for Psoriatic Arthritis; IBP: inflammatory back pain; IL: interleukin; LEI: Leeds Enthesitis Index; MASES: Maastricht Ankylosing Spondylitis Enthesitis Score; MRI: magnetic resonance imaging; PASI: Psoriasis Area and Severity Index; PsA: psoriatic arthritis; PsO: psoriasis; sDMARD: synthetic disease-modifying antirheumatic drug; SIJ: sacroiliac joint; VAS: visual analog scale.