| ObjectiveTo study the feasibility and safety of the iliac screw placement by radio-graphic measurement of Chinese adult per cutem iliac serew passage bwtween posterior superior illiac spine(PSIS) and anterior inferior iliac spine(AIIS).MethodsReconstruct 56 Chinese adult ilia by multilayer helico-CT. Define the beginning loxosis fault which includs the both line from posterior superior iliac spine to top of acetabular bone. After the posterior superior iliac spine as the center, reconstruct oblique fault images since the beginning loxosis fault to cephalic one at 0.5°as the rotation units .Measure the shortest distance between ilium cortex and midline from each faule, select the faules which the distance exceed 4mm as the available ones and the ending fault which the distance less than 4mm. The angle between midline of ending fault and sagittal line is the metered angle of passage.Results(1)There exist an osseous passage from PSIS to AIIS, and which can used as the iliac-screw path for anchor iliac bone fracture. (2)The shape of ilium ranges from "I" to "S" with the rotation from beginning to ending falut. (3) The beginning angle is(38.13±0.94)°and the ending one is (23.63±1.17)°, the angle of needling is(24.68±1.06)°. The angles have no gender differences. Conclusion(1)PSIS-AIIS passage can be used as the iliac-screw path for anchor ilium fracture. (2) The pasaage with PSIS as the needling point and the needle end clinism angle ranged from (23.63±1.17)°-(38.13±0.94)°headside and (24.68±1.06)°lateral side is the safe compass. |
