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目的:为耻骨上支逆行拉力螺钉内固定提供解剖学基础。方法:取半骨盆标本30个,选取耻骨上支有代表性的两个截面,第1截面距髂耻隆起1.5cm,第2截面位于耻骨上支远端,采用圆盘法确定截面的圆心及直径,将一斯氏针经2截面的圆心顺行穿出耻骨上支,其出针点P1即为逆行拉力螺钉的入针点。两截面的最小直径即为逆行拉力螺钉的最大直径。将两截面解剖复位,将斯氏针逆行打入,其在耻骨上支内的长度即为逆行拉力螺钉的最大长度,该斯氏针即为耻骨上支的轴心。结果:第1截面呈棱形,直径为(6.8±0.9)mm,第2截面呈扁平状,直径为(5.3±0.3)mm,斯氏针于耻骨上支前端的出针点P1位于耻骨嵴中点下方(7.5±0.5)mm处,斯氏针平行于耻骨梳,斯氏针在耻骨上支内的最大长度为(61.1±9.7)mm。结论:耻骨上支逆行拉力螺钉入钉点位于耻骨嵴中点下方(7.5±0.5)mm,其方向平行于耻骨梳,最大直径为(5.3±0.3)mm,最大长度为(61.1±9.7)mm。
Objective: To provide anatomical basis for suprapubic retrograde lag screw fixation. METHODS: Thirty specimens of the pelvis were selected. Two sections of the suprapubic branch were selected. The first section was 1.5 cm from the ilium and the second section was located on the distal side of the suprapubic branch. The center of the cross section was determined by the disc method Diameter, will be a cross-section of the Si pin through the center of the pubis supra pubic branch, the needle point P1 is retrograde lag screw into the needle point. The minimum diameter of the two sections is the maximum diameter of the retrograde lag screw. Anatomy of the two cross-section reduction, the Stylus needle retrograde, the length in the suprapubic branch is the maximum length of the retrograde lag screw, which is the axis of the supra-pubis. Results: The first cross-section was prismatic, the diameter was (6.8 ± 0.9) mm, the second cross-section was flat and the diameter was (5.3 ± 0.3) mm. Below the midpoint (7.5 ± 0.5) mm, the Stroke was parallel to the pubic comb, and the maximum length of the Stem’s needle in the suprapubic branch was (61.1 ± 9.7) mm. CONCLUSIONS: The suprapubic retrograde lag screw is located below the midpoint of the pubis crest (7.5 ± 0.5) mm, parallel to the pubic comb, with a maximum diameter of (5.3 ± 0.3) mm and a maximum length of (61.1 ± 9.7) mm .