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- W2385632898 abstract "Objective:To study the placement of inserting sacral screw through the five-seven o'clock point on the articular facet of the superior articular process by radiological anatomical means.Method:The alas and the superior articular processes of the 50 sacra specimens were twined with 1.0 mm diameter steel wire.The 3.0 mm diameter steel ball was fixed on the five-seven o'clock point.The anteroposterior radiographs were performed for observing the relation between the ball and the wire,for measuring the distances from the point to the lateral wall of the sacral canal,and to the superior base of the sacrum.50 sacra were scanned through the five-seven o'clock point by CT for investigating the shape of transverse sections of the sacra,for measuring the depth of screw at 0° and 10° inward to the sagittal plane.Result:According to the X-ray film,the ball was out of the sacral canal.The distance from the ball to the lateral wall of sacral canal was 〔(6.7±2.3) (5.0～12.0) 〕mm on the left,〔(6.6±1.9) (5.0～11.0)〕 mm on the right.The distance from the ball to the superior base of the sacrum was 〔(11.5±5.3) (5.0～28.0)〕 mm on the left and 〔(11.6±5.4) (5.0～29.0)〕 mm on the right.On the CT scans,the entrance depth of the sacral screw was 〔(32.6±3.5 )(24.0～40.0) 〕mm on the left,〔(32.6±3.5)(24.0～42.0)〕 mm on the right at 0° and 〔(38.1±3.8) (30.0～46.0)〕 mm on the left,〔(38.0±3.9) (30.0～46.0) 〕mm on the right at 10° inward to the sagittal plane.Conclusion:The entrance point of the sacral screw:The superior articular processes of sacrum exist unvaryingly.If the articular facet of the superior articular process is regarded as a clock,the entrance point of sacral screw is at the five o'lock point on the right,and at the seven o'clock point on the left.The depth and the length of the sacral screw can be depended on X-ray films and CT scans.The depth of the sacral screw is 30.0～35.0 mm at 0° and 30.0～40.0 mm at 10°.The point of the sacral screw is located in the medial part of the safe triangular zone." @default.
- W2385632898 created "2016-06-24" @default.
- W2385632898 creator A5080164057 @default.
- W2385632898 date "2004-01-01" @default.
- W2385632898 modified "2023-09-25" @default.
- W2385632898 title "Radiological anatomic study for the placement of sacral screw through the five-seven o'clock point on the articular facet of the superior articular process" @default.
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