The quadrilateral length and thickness of the Lumbar isthmus and clinical significance
XU Hong-Hai, JU Qiang-Xiang, ZHANG Huo-Lin, GUO Xiong, FANG Hai-Bo, LIU Zong-Zhi, LUO Zhen-Qun, WANG Xiao-Qiang, LI Yong, LIU Jun, LIN Feng-Yu, MA Jiang, QI Ji
Chinese Journal of Clinical Anatomy ›› 2013, Vol. 31 ›› Issue (3) : 261-264.
The quadrilateral length and thickness of the Lumbar isthmus and clinical significance
Objective To measure the quadrilateral length and thickness of the Lumbar isthmus in order to provide the practical anatomy data for the lamina osteotomy replantation and for the design of a "工" shaped titanium plate. Method The length and thickness of the isthmus of 32 dried adult male's lumbar spines were directly measured from L1 to L5 with a vernier caliper and dividers, excluding the appearances of malformations and breakage. Results (1)The length of the superior(A) edge of the Lumbar isthmus gradually increased from L2 to L5 (from 6.47±0.90 mm at L2 to 8.38±0.98mm at L5),and that of the inferior(C) edge progressively decreased from L1 to L5 (from 7.86±0.93 mm at L1 to 4.77±0.64 mm at L5); The medial (D) edge of the isthmus from 19.07±0.86 mm at L1, the longest, to 12.92±1.40mm at L5, the shortest; The lateral(B) edge of the isthmus from 11.24±0.80 mm at L3, the longest, to 9.87±0.65 mm at L4, the shortest; (2) The thickness of the intersection E between the lateral edge and the superior edge ranges from 6.10±0.23 mm at L1, the thinnest, to 7.53±0.35mm at L3, the thickest; The thickness of the intersection F between the lateral edge and the medial edge ranges from 5.10±0.25 mm at L1, the thinnest, to 6.41±0.27 mm at L3, the thickest; The thickness of the intersection G between the inferior edge and the medial edge gradually decreases from L1 to L5 (from 7.51±0.42mm at L1 to 6.25±0.27mm at L3); The thickness of the intersection H between the lateral edge and the inferior edge gradually increases from L1 to L5 (from 8.59±0.30 mm at L1 to 10.11±0.35 mm at L5). Conclusion The study further reveals the Lumbar isthmus quadrilateral anatomical parameters. The best part of the Lumbar isthmus Osteotomy is at 3 ~ 4 mm from the lateral edge of the isthmus. It is in parallel with the medial and lateral edges. The thickness of the "工" shaped titanium plate is 1.2 mm, the length of the upper side is 9mm, the length of the lower side is 10mm, and the height is10 mm.The lengths of the miniature screws are 6 、8、10, and 12 mm, while the diameter is 2 mm.
Lumbar / Isthmus / Measurement / Application
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