Table 1.

Grading, description, and patients in each category of SpA-TRI.

GradeDescriptionn (%)
0Normal0
1Osteopenia or suspicious findings, joint space narrowing, bony erosion(s), periosteal whiskering, enthesophyte(s).0
2Definite joint space narrowing, bony erosion(s), periosteal whiskering (no joint space involved), or enthesophyte(s) in the plantar fascia or Achilleal tendon attachments.9 (50.0)
3Paraarticular enthesophyte(s), incomplete bridging.6 (33.3)
4Bony ankylosis, joint space fusion, or complete bridging.3 (16.6)
  • SpA-TRI: SpondyloArthropathies Tarsal Radiographic Index. Modified from Pacheco-Tena, et al. Ann Rheum Dis 2002;61:330–4; with permission.