Hounsfield units in assessing bone mineral density in ankylosing spondylitis patients with cervical fracture-dislocation

Figure 4 A 68-year-old man developed paralysis after a traffic accident. A: Preoperative computed tomography suggested ankylosing spondylitis combined with C2/3 fracture-dislocation; B and C: We performed a reduction with a Halo vest and an anterior combined posterior surgery; D: Postoperative bisphosphonates were used for anti-osteoporosis treatment, and cervical computed tomography was repeated at 6 mo postoperatively; E: We calculated the Hounsfield unit values of the C5 vertebra and found that the postoperative Hounsfield unit values (179.67) were significantly higher than preoperative (157.44).