Laboratory investigations and detailed MRI findings among the studied groups of patients. Data are the mean ± SD unless otherwise indicated.
| Characteristic | PsA, n = 30 | AS, n = 5 | ReA, n = 5 | UC, n = 5 | Crohn’s Disease, n = 5 | Skin Psoriasis, n = 6 |
|---|---|---|---|---|---|---|
| ESR, mm/h* | 42.6 ± 9.81 | 46.6 ± 4.83 | 56.6 ± 13.03 | 19.2 ± 8.17 | 21.8 ± 8.32 | 13.5 ± 3.56 |
| CRP, mg/dl* | 3.23 ± 1.25 | 3.6 ± 0.82 | 4.34 ± 3.0 | 2.6 ± 1.03 | 1.7 ± 1.3 | 0.6 ± 0.49 |
| Side of MRI, no. (%) | ||||||
| Unilateral | 9 (30) | 0 (0) | 2 (40) | 0 (0) | 0 (0) | 0 (0) |
| Bilateral | 21 (70) | 5 (100) | 3 (60) | 5 (100) | 5 (100) | 6 (100) |
| Synovial thickness, mm* | 2.66 ± 0.94 | 2.24 ± 1.2 | 2.66 ± 0.97 | 0.92 ± 0.31 | 1.3 ± 0.414 | 1.8 ± 0.82 |
| Manifestations, no. (%) | ||||||
| Soft tissue edema | 21 (70) | 1 (20) | 2 (40) | 1 (20) | 1 (20) | 2 (33.3) |
| Bone erosions | 7 (23.3) | 1 (20) | 2 (40) | 0 (0) | 0 (0) | 0 (0) |
| Cartilage erosions | 12 (40) | 1 (20) | 3 (60) | 2 (40) | 0 (0) | 0 (0) |
| Baker’s cyst | 3 (10) | 0 (0) | 1 (20) | 0 (0) | 0 (0) | 0 (0) |
| BME | 8 (26.7) | 2 (40) | 2 (40) | 0 (0) | 0 (0) | 1 (16.7) |
| Single lesion in the same joint | 28 (93.3) | 4 (80) | 4 (80) | 2 (40) | 3 (60) | 4 (66.7) |
| Combined lesions in the same joint | 2 (6.7) | 1 (20) | 1 (20) | 0 (0) | 0 (0) | 1 (16.7) |
| Enthesitis by site, no. (%) | ||||||
| MCL | 12 (40) | 2 (40) | 2 (40) | 1 (20) | 1 (20) | 0 (0) |
| LCL | 5 (16.7) | 2 (40) | 0 (0) | 0 (0) | 1 (20) | 0 (0) |
| ACL | 0 (0) | 0 (0) | 0 (0) | 0 (0) | 0 (0) | 0 (0) |
| PCL | 2 (6.7) | 0 (0) | 1 (20) | 0 (0) | 0 (0) | 0 (0) |
| Patellar tendon insertion | 7 (23.3) | 1 (20) | 3 (60) | 1 (20) | 0 (0) | 5 (83.3) |
| Biceps femoris insertion | 3 (10) | 0 (0) | 0 (0) | 0 (0) | 0 (0) | 0 (0) |
| MPFL | 2 (6.7) | 1 (20) | 0 (0) | 0 (0) | 1 (20) | 1 (16.7) |
| LPFL | 1 (3.3) | 0 (0) | 0 (0) | 0 (0) | 0 (0) | 0 (0) |
↵* Mean ± SD. PsA: psoriatic arthritis; AS: ankylosing spondylitis; ReA: reactive arthritis; UC: ulcerative colitis; BME: bone marrow edema; MCL: medial collateral ligament; LCL: lateral collateral ligament; ACL: anterior cruciate ligament; PCL: posterior cruciate, MPFL: medial patellofemoral ligament; LPFL: lateral patellofemoral ligament.