Table 3.

Feature of poor prognosis and disease activity for active sacroiliac arthritis

Feature of poor prognosis

Radiographic damage of any joint (erosions or joint space narrowing by radiograph)

Disease activity levels

Low disease activity (must satisfy all)

Normal back flexion

Erythrocyte sedimentation rate or C-reactive protein level normal

Physician global assessment of overall disease activity <4 of 10

Patient/parent global assessment of overall well-being <2 of 10

Moderate disease activity (does not satisfy criteria for low or high activity)

1 or more features greater than low disease activity level AND fewer than 2 features of high disease activity

High disease activity (must satisfy at least 2)

Erythrocyte sedimentation rate or C-reactive protein greater than twice upper limit of normal

Physician global assessment of overall disease activity ≥7 of 10

Patient/parent global assessment of overall well-being ≥4 of 10