PMID: 25739257Mar 6, 2015Paper

Classification of upper sacral segment based on continuous axial pelvic computed tomography scan

Zhongguo gu shang = China journal of orthopaedics and traumatology
Hong-Min CaiChuan Zhang

Abstract

To introduce a classification system of upper sacral segment and its significance based on the continuous pelvic axial computed tomography scan. The whole pelvis 2.0 mm thick axial scan images of 127 cases were observed, the sacroiliac screw channel of S1 were measured, according to the size of the transverse screw channel the upper sacral segment were classified. Such as transverse screw channel existed and in at least 4 layer scan images its width was > 7.3 mm, it was defined as sacral segment of the normal type. Such as transverse screw channel existed and its maximum width was 7.3 mm or less on scanning level, it was defined as a transitional. Such as transverse channel did not exist, or its width on all scanning level was 0 mm or less, it was defined as dysplastic. Various cases,percentage, and the average of the transverse screw channel were calculated. There were 58 normal (45.7%),42 transitional (33.1%), and 27 dysplastic (21.2%) upper sacral segments with an averaged width of the tansverse screw channel of 13.9 mm, 5.2 mm, and 0.9 mm, respectively. Each specimen could be defined as one of the three types of upper sacral segment without exceptions. It is possible to insert a transverse iliosacral screw into a normal upp...Continue Reading

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