Objective: To compare the potential incidence of nerve root (ventral and dorsal ramus) injury caused by cervical transarticular screws and Roy-Camille lateral mass screws. Methods : Insertion techniques with Kleka...Objective: To compare the potential incidence of nerve root (ventral and dorsal ramus) injury caused by cervical transarticular screws and Roy-Camille lateral mass screws. Methods : Insertion techniques with Klekamp transarticular screws and Roy-Camille lateral mass screws were respectively performed in this study. Each technique involved four specimens and 40 screws, which were inserted from C3 to C7. And 20-mm-long screws were used to overpenetrate the ventral cortex. The anterolateral aspect of the cervical spine was carefully dissected to allow observation of the screw-ramus relationship. Results : The overall percentage of nerve invasion was significantly lower with Klekamp (45%) technique than with Roy-Camille ( 85 %) technique ( P 〈 0.05 ). The largest percentage of nerve invasion for Klekamp transarticular screws was found at the dorsal ramus (25 % ), followed by the ventral ramus ( 15 % ) and the bifurcation of the ventral dorsal ramus ( 5 % ). The largest percentage of nerve invasion for Roy-Camille lateral mass screws was found at the ventral ramus (80 % ). Conclusion : The potential risk of nerve root invasion is lower with Klekamp transarticular screws than with Roy Camille lateral mass screws.展开更多
文摘Objective: To compare the potential incidence of nerve root (ventral and dorsal ramus) injury caused by cervical transarticular screws and Roy-Camille lateral mass screws. Methods : Insertion techniques with Klekamp transarticular screws and Roy-Camille lateral mass screws were respectively performed in this study. Each technique involved four specimens and 40 screws, which were inserted from C3 to C7. And 20-mm-long screws were used to overpenetrate the ventral cortex. The anterolateral aspect of the cervical spine was carefully dissected to allow observation of the screw-ramus relationship. Results : The overall percentage of nerve invasion was significantly lower with Klekamp (45%) technique than with Roy-Camille ( 85 %) technique ( P 〈 0.05 ). The largest percentage of nerve invasion for Klekamp transarticular screws was found at the dorsal ramus (25 % ), followed by the ventral ramus ( 15 % ) and the bifurcation of the ventral dorsal ramus ( 5 % ). The largest percentage of nerve invasion for Roy-Camille lateral mass screws was found at the ventral ramus (80 % ). Conclusion : The potential risk of nerve root invasion is lower with Klekamp transarticular screws than with Roy Camille lateral mass screws.