Methods: Twenty lumbar segments were dissected and studied. The relationship between the retroperitoneum, psoas muscle, and the lumbar plexus was analyzed.

方法：解剖并研究20个腰椎节段，分析腹膜后隙、腰大肌和腰丛之间的关系。

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For example, many lumbar spinal fusion patients have sacroiliac joint pain due to reduced motion in lumbar spine segments.

例如，许多腰椎融合病人会出现骶髂关节疼痛，因为腰椎节段的活动减少。

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Method: 72 cases (82 segments) with lumbar segmental instability were treated by PLIF with 3 kinds of interbody fusion techniques.

方法：本组采用3种PLIF手术治疗腰椎节段性不稳定患者72例，共82个节段。

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