Table 6.
Estimated prevalence of each of the items listed in the Assessment of Spondyloarthritis International Society classification criteria for axial and peripheral spondyloarthritis in the different categories of juvenile onset disease in children and adolescents*
| Ankylosing spondylitis | Undifferentiated spondyloarthritis | Enthesitis related arthritis | Psoriatic spondyloarthritis | Psoriatic arthritis not related to spondyloarthritis | |
|---|---|---|---|---|---|
| Sacroiliitis on MRI |
+++ |
+ |
+ |
+ |
- |
| Sacroiliitis on X-rays |
++++ |
- |
+ |
+ |
- |
| Inflammatory back pain |
++++ |
+ |
+ |
+ |
- |
| Arthritis |
++++ |
++++ |
++++ |
++++ |
++++ |
| Enthesitis (heel pain) |
+++ |
+++ |
+++ |
++ |
- |
| Uveitis |
++ |
+ |
+ |
+ |
- |
| Dactylitis |
+ |
++ |
++ |
++ |
+++ |
| Psoriasis |
+ |
- |
- |
++++ |
++++ |
| Crohn’s/colitis |
+ |
- |
- |
+ |
- |
| Good response to NSAIDs |
+++ |
NA |
NA |
NA |
NA |
| Family history for SpA |
++ |
+ |
+ |
++ |
- |
| HLA-B27 |
+++ |
++ |
++ |
++ |
- |
| Elevated C reactive protein |
+++ |
+++ |
+++ |
+++ |
++ |
| Previous infection | + | - | - | - | - |
*Based on the literature and on the opinion of local experts in the care of these children.
The presence of such items excludes the undifferentiated spondyloarthritis and enthesitis related arthritis as diagnosis.
MRI = magnetic resonance imaging. NSAIDs = Non-Steroidal Antinflammatory Drugs. NA = data not available. SpA = Spondyloarthritis.