背景资料分析：对于经椎弓根操作，精确测量椎弓根峡部形态学参数很重要。
Summary of Background Data. Accurate measurement of morphometric parameters of pedicle isthmus is important for transpedicular procedures.
目的：探讨腰椎上关节突外缘的形态特点及其与椎弓根中心的关系。
Objective: To study the quantitative relationship between the lateral margin of the superior facet and the pedicle center of lumbar vertebrae.
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