Methods Eighteen cases of malposition of transpedicular screw internal fixation in thoracolumbar spine were detected by X-ray and the causes were analyzed according to the location of perforation.

• 方法对行椎弓根螺钉内固定手术术中探察、X线监测发现置钉位置不佳者18例，按穿破骨壁部位不同分析原因。