ABSTRACT
Objective To observe the blood vessels distribution in iliac blood velles triangular area of the lumbosacral vertebrae and confirm the range of safety working area,so as to provide anatomic data for anterior lumbosacral interbody fusion.Methods CTA imaging da-ta of abdominal vessels were randomly collected from 32 adult patients.Observed the distribution and intersection features of lumbosacral ver-tebral ventral blood vessels.Measured the distance from the bifurcation or confluence to the L5 dise,level interval of iliaca vessels in the infe-rior boundary of L5 ,and width of L5 /S1 intervertebral space.And then computed the range of safety working area and conducted a preliminary classification.Results The lumbosacral vertebral ventral operation space is mainly (87.4%)composed of left iliac vein and right common iliac artery.In this study,patients of type A accounted for 87.4%,vascular clearance of the L5 dise was (3.8 ±1.1)cm,safety working area was (5.2 ±1.2)cm2 ,and the display ratio of L5 /S1 was 73.2%.Patients of type B accounted for 6.3%,vascular clearance of the L5 dise was (4.2 ±0.5)cm,safety working area was (7.1 ±0.2)cm2 ,and the display ratio of L5 /S1 was 81.0%.Patients of type C accounted for 6.3%,vascular clearance of the L5 dise was (1.0 ±0.7)cm,safety working area was (1.3 ±0.7)cm2 ,and the display ratio of L5 /S1 was 31.2%.The differences of anatomical parameters among the three types were statistically significant (P <0.05).Conclusion The study showed that most ordinary people have enough operation space in the lumbosacral vertebral ventral,which is suitable for anterior lumbosacral interbody fusion,but it is necessary to take preoperative imaging screening.