Fig. 2

Imaging measurement [12]. AVHr is defined as the ratio of the anterior vertebral height to the adjacent unfractured anterior vertebral height. The specific calculation method is as follows: the anterior edge height a of the fractured upper vertebral body, the anterior edge height b of the fractured lower vertebral body, the anterior edge height c of the fractured vertebral body, AVHr = 2 * C/a + b * 100. RKA is defined as the angle between the lower endplate of the fractured vertebral body and the lower endplate directly above the vertebral body. SCCr is the spinal canal clearance ratio, calculated as the ratio of the diameter of the vertebral canal at the compression site (y) on the sagittal X-ray to the diameter of the upper vertebral canal (x), SCCr = y/x * 100