To avoid cortical violation of the medial pedicle wall , the tip of the curet or awl should not extend beyond the medial border of the pedicle on the anteroposterior view before reaching the posterior margin of the vertebral body on the lateral view .

为避免突破椎弓根内壁的骨皮质，在侧位片上达到椎体的后侧边界之前，刮匙或锥钻的尖端不应超出椎弓根前后位片上的内侧边界。