椎板下棘的形态学特点及其临床意义

目的：观测椎板下棘的形态特点，探讨其在显微内窥镜腰椎间盘切除术(MED)中的临床意义。方法：对42具成人干燥椎骨和10件脊柱腰骶段标本的椎板下棘进行观测，分析其对椎间管构成的影响；结合MED术式的通道和操作过程，分析其可能导致的并发症。结果：椎板下棘位于椎板下缘前外近椎弓根下切迹处。可出现于所有胸腰椎，出现率为83．3％；出现率最高在第12胸椎，为52．4％。椎板下棘分布不规则，出现在胸腰段较多。结论：椎板下棘是胸腰椎的骨性结构，有必要给予命名；椎板下棘参与构成神经根管的骨性后壁，可造成神经根受压；后路MED可引起椎板下棘断脱，造成神经根受压或损伤。

The morphologic features and clinical significance of spina lamina vertebrae inferior

Objective: To observe the anatomical features of spina lamin a vertebrae inferior(SLVI) and study its clinical significance in the Microendos copy discectomy(MED). Methods: The SLVI was observed in 42 sets of dried adult v ertebrae and 10 segments of lumbosacrovertebral column. The influence on the ner ve root canal, and on the effect of MED was analyzed. Results: SLVI was found at the anterior portion of inferior border of vertebral laminae, where it was near the incisura lamina vertebrae lateralis. SLVI was a bony spina with its apex do wnward, and presented in some thoracic or lumbar vertebrae. Its occurrence rate was 83.3% individually in our samples. The highest occurrence rate was found at the 12th thoracic vertebra which might be up to 52.4%. The distribution of SLVI was irregular. It presented more at the thoraco lumbar section. Conclusions: SLV I is a bony structure contributing to the posterior wall of the nerve root canal . It may cause the nerve roots to be compressed. It may be broken in the operati on of MED and results in the damage of the passing nerve roots, so it is necessa ry to be named.