Figure 5.

Changes in vertebral shapes in ankylosing spondylitis. (a) Vertebral deformation in ankylosing spondylitis. Ha, anterior height; Hp, posterior height. (b) Vertebral deformation due to extensive erosive discitis with osteitis in ankylosing spondylitis (Andersson lesion).

Geusens and Lems Arthritis Research & Therapy 2011 13:242   doi:10.1186/ar3375
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