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.