Abstract：Objective To measure the diameter of the iliac venous tunnel (IVTD) ahead the lower lumbar vertebrae and the lower lumbar lordosis angle (LLLA) using CT, and to analyze their clinical significance and the correlations between IVTD,LLLA and sex, and age, respectively.Methods Data of patients in the database of CT imaging of abdominal-pelvic part (lumbar spine included ) from July, 2009 to December, 2014 in southeast Hospital, Xiamen University were retrospectively analyzed, 320 health adults were selected by simple stratified sampling according to sex and age as the control group. Every age stage (1-15, 16-25, 26-35, 36-45, 46-55, 56-65, 66-75 years old and aged over 76) contained 40 objects with equal male and female. In the period, CT data of 55 patients with iliac vein compression syndrome (IVCS) were obtained as the IVCS group. The LLLA and the IVTD were measured respectively on CT transection and reconstructive sagittal plane. Differences of LLLA and IVTD between sex and in age of control group were assessed by variance analysis with Bonferroni test for correction of multiple comparison of mean. Pearson correlation analysis were used to evaluate the correlations of LLLA and IVTD with age respectively, Meanwhile, the discrepancies of LLLA and IVTD between control and IVTD groups were performed t test for males and females, respectively, and diagnostic thresholds of IVT stenosis for predicting IVCS were analyzed respectively for males and females by response of curve (ROC) of diagnostic tests.Results In the normal group, the LLLA was 128.1°±6.7° and IVTD was (4.9±1.2)mm, both were negatively correlated with age(r=-0.673, -0.662, all P values＜0.01). LLLA were positively correlated with positive correlation (r=0.812, P＜0.01). The LLLA of males was 130.6°±6.1° and females was 125.5°±6.0°. The IVTD of males was (5.4±1.2)mm and females was (4.3±1.0)mm. The LLLA and IVTD values of males were higher than females, there were statistical differences (t=7.426, 9.103, all P values＜0.05). In IVCS group, the LLLA of males was 123.3°±2.3° and IVTD was(2.5±0.3)mm, compared with the normal group[128.1°±2.7°,(5.0±0.8)mm] there were statistical differences (t=6.993, 12.604, all P values <0.01). The LLLA of females was 122.1°±5.8° and IVTD was(2.3±0.4)mm, compared with the normal group [125.1°±4.9°, (4.1±0.8)mm] there were statistical differences(t=2.898,12.906, all P values<0.01). ROC of IVTD showed that 2.98 mm for males and 2.96 mm for females were their optimal cutoff value of IVTD predicting the risk of IVCS. The diagnostic sensitivity was 99%, 93%, and specificity in both groups was 100%, respectively.Conclusions The IVTD and LLLA are very different with sex and age, and CT imaging can exactly assess the condition of IVT and predict the risk of IVTS.
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Ouyang Lin, He Ping, Xu Siding, Chen Shuibin, Zhou Manzhen.. Correlations of the iliac venous tunnel ahead the lower lumbar vertebrae and lower lumbar lordosis angle with sex,age and its clinical significance. Chinese Journal of Anatomy and Clinics, 2017, 22(1): 11-17.
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2017, Vol. 22 
