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Table 1 Description of the mSASSS and RASSS scoring systems.

From: Scoring radiographic progression in ankylosing spondylitis: should we use the modified Stoke Ankylosing Spondylitis Spine Score (mSASSS) or the Radiographic Ankylosing Spondylitis Spinal Score (RASSS)?

  mSASSS RASSS
Spinal segments assessed   
   - Cervical spine Lower border of C2 to upper border of T1 Lower border of C2 to upper border of T1
   - Thoracic spine Not included Lower border of T10 to upper border of T12
   - Lumbar spine Lower border of T12 to upper border of S1 Lower border of T12 to upper border of S1
Range of scoring system 0-72 0-84
Scoring definitions   
   - 0 No change No change
   - 1 Erosion, squaring, sclerosis Squaring only for the thoracic and lumbar segments; no erosions scored; sclerosis scores for all VCs
   - 2 Syndesmophytes Syndesmophytes
   - 3 Bridging syndesmophytes/ankylosis Bridging syndesmophytes/ankylosis
  1. mSASSS, modified Stoke Ankylosing Spondylitis Spine Score; RASSS, radiographic Ankylosing Spondylitis Spinal Score; C, cervical; T, thoracic; S, sacral.