Table 2 Diagnosis of osteoporosis by DXA and CT scan between BS and non-BS groups.

From: CT-based hounsfield unit as an alternative osteoporosis assessment in ankylosing spondylitis patients with bamboo spine

Diagnosis of osteoporosis

By DXA

By hounsfield units (HU)

BS (nā€‰=ā€‰189)

24 (12.7%)

171 (90.5%)

Non-BS (nā€‰=ā€‰335)

76 (22.7%)

261 (77.9%)

  1. DXA, dual-energy X-ray absorptiometry; CT, computed tomography; BS, bamboo spine.
  2. DXA-based osteoporosis was defined as T-scoreā€‰ā‰¤ā€‰āˆ’ā€‰2.5.
  3. CT-based osteoporosis was defined as HUā€‰<ā€‰135 as adopted by Ahern et al.20 and Anderson et al.21.
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