Laine T, Mäkitalo K, Schlenzka D, Tallroth K, Poussa M, Alho A
ORTON Orthopaedic Hospital, Invalid Foundation, Helsinki, Finland.
Eur Spine J. 1997;6(6):402-5. doi: 10.1007/BF01834068.
A prospective study of the accuracy of titanium pedicle screw placement in 30 low back operations was performed. The postoperative plain radiographs and CT reformation images were evaluated by two independent radiologists. Thirty-two out of 152 screws (21%) perforated the pedicle cortex. One-tenth of the perforations was detected with conventional radiography. In ten patients (33%) all the screws were located within the pedicle. The clinical significance of this study lies in the finding that pedicle perforations are more frequent than is generally believed and that, in spite of the many malplacements, no screw that perforated by less than 4.0 mm caused neurological problems. Only one nerve root lesion was detected.
对30例腰椎手术中钛椎弓根螺钉置入的准确性进行了前瞻性研究。术后的X线平片和CT重建图像由两名独立的放射科医生进行评估。152枚螺钉中有32枚（21%）穿破椎弓根皮质。十分之一的穿孔通过传统X线摄影被检测到。在10例患者（33%）中，所有螺钉均位于椎弓根内。本研究的临床意义在于发现椎弓根穿孔比一般认为的更常见，并且尽管有许多放置不当的情况，但穿破小于4.0mm的螺钉没有引起神经问题。仅检测到1例神经根损伤。
