Conclusions : radiculomedullary arteries would not be damaged if intercostal arteries are deligated at the lateral of transversocostal joint or beyond 1cm of the caput costaes on anterior approach . the distance between two adjacent intercostal or lumbar arteries provide a safe window through which a herniated thoracic disc maybe approached . it indicates the least injury of vessels in osteotomy via the posterior approach in the middle of arcus vertebrae and vertebral body 结论：脊柱前路矫形应在根髓动脉分支前，结扎多个节段血管，脊髓血供可以通过后方代偿，能避免累及脊髓根髓动脉产生脊髓损伤；侧前入路应在根髓动脉分支后，经胸、腰段毗邻的动脉之间，椎间盘切除或椎间隙减压伤及根髓动脉出现脊髓损伤机率最小。
