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目的：为改良Ｓｔｅｆｆｅｅ钢板在腰骶椎内固定术中的应用提供解剖学基础。方法：在８具成人尸体标本上摹拟Ｌ５脊椎滑脱的Ｓｔｅｆｆｅｅ手术治疗。在Ｌ４～Ｓ１脊椎上分别安放Ｓｔｅｆｆｅｅ钢板和改良Ｓｔｅｆｆｅｅ钢板，比较２种内固定器械固定位置的解剖差异，并对１５副腰骶椎干燥骨标本做了经椎弓根内固定相关的数据测量。结果：传统的Ｓｔｅｆｆｅｅ钢板固定Ｓ１椎弓根螺钉安放困难，且进入椎管的机会多，或者是上２枚螺钉易套入钢板槽孔，而下面的螺钉难以套入钢板槽孔。改良Ｓｔｅｆｆｅｅ钢板可克服上述弊端，更符合局部解剖形态要求。结论：改良Ｓｔｅｆｆｅｅ钢板有科学的形态学依据，可临床试用。
Objective: To provide an anatomical basis for the improvement of Steffee plate in lumbosacral vertebral fixation. METHODS: Steffee surgical procedures simulating L5 spondylolisthesis were performed on 8 adult cadaver specimens. Steffee and Steffee plates were placed on the L4-S1 vertebra respectively. The anatomical differences of the fixation positions of the two kinds of internal fixation devices were compared. Fifteen specimens of lumbosacral bone were measured by pedicle screw fixation. Results: The traditional Steffee plate fixation S1 pedicle screw placement difficulties, and the opportunity to enter the spinal canal, or the upper two sets of screws easily set into the slot, and the following screw is difficult to set into the slot. Improved Steffee steel can overcome the above drawbacks, more in line with local anatomical requirements. Conclusion: Modified Steffee plate has a scientific basis for morphological, clinical trials.