. Author manuscript; available in PMC: 2013 Apr 1.

Published in final edited form as: Best Pract Res Clin Rheumatol. 2012 Apr;26(2):251–261. doi: 10.1016/j.berh.2012.03.001

Table 2.

Assessment of Spondyloarthritis International Society classification criteria for axial spondyloarthritis (SpA, spondyloarthritis).

1. Chronic back pain

2. Age at onset < 45 years

3. Sacroiliitis on imaging (MRI or radiographs) and 1 SpA feature

HLA-B27 positive and 2 SpA features

SpA features

Inflammatory back pain

Arthritis

Heel enthesitis

Dactylitis

Uveitis

Psoriasis

Ulcerative colitis or Crohn’s disease

Good response to nonsteroidal anti-inflammatory medications

Family history of SpA

HLA-B27

Elevated C-reactive protein level