Table 2 Comparison of preoperative and postoperative BMD values of all segments.

From: Assessing vertebral bone density changes with phantomless QCT after posterior open reduction and internal fixation

 

BMD1

BMD2

Z

P values

Cranial adjacent vertebrae (median [IQR])

153.6 (111.4-187.6)

132.4 (105.3–164.0)

− 4.586

< 0.001

Upper instrumented vertebra (median [IQR])

139.3 (113.2-177.3)

110.1 (71.1-143.7)

− 5.454

< 0.001

Injured vertebra (median [IQR])

182.3 (134.3-215.1)

153.6 (118.1-199.4)

− 3.679

< 0.001

Lowest instrumented vertebra (median [IQR])

126.9 (101.8–158.0)

110.6 (77.8-146.6)

− 5.116

< 0.001

Caudal adjacent vertebrae (median [IQR])

120.7 (94.2-155.8)

111.1 (81.6-141.4)

− 4.913

< 0.001

  1. BMD bone mineral density, IQR interquartile range.
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