Figure 5From: Osteoimmunology and osteoporosisChanges 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).Back to article page