A retrospective study of the correlation between the iliac cortical density line and pelvic tilt angle / 国际生物医学工程杂志

ABSTRACT

Objective:To investigate the correlation between the iliac cortical density line and pelvic tilt (PT) in X-ray films of patients with kyphosis.Methods:The imaging data of 67 patients with kyphosis treated in Tianjin Beichen Hopsital from August 2016 to December 2019 were analyzed retrospectively. PT and iliac tilt (IT) were measured on lateral X-ray of the spine. IT was defined as the angle between the density line of the iliac cortex and vertical direction. The correlation between PT and IT was analyzed, and a linear regression model was established.Results:PT and IT can be determined by X-ray lateral films of spine in 67 patients. Pearson correlation analysis results showed that PT was significantly correlated with IT( r=0.852, P<0.05). Subgroups analysis was conducted by gender. The linear regression formulas for females and males were PT=IT-12.9° and PT=IT-16.7°, respectively. Conclusions:When it is difficult to identify the femoral head on X-ray film, IT can be measured conveniently and directly through the density line of the iliac cortex, and then PT can be reliably evaluated through IT.