| 摘要 |
A vertebral pedicle screw includes a screw body driven into a vertebral pedicle, a housing assembled to an upperend of the screw body and having grooves for seating a rod and a threaded portion for locking a fastening bolt, the fastening bolt pressing the rod positioned thereunder as it is threaded downward, and a fastening ring inserted into the housing. The vertebral pedicle screw further includes an insert placed on an outer surface of a screw head of the screw body in the housing, installed to be partially come into contact with the fastening ring on an upper portion thereof, and accommodating the screw head of the screw body on a curved inner surface thereof such that the insert and the screw head are brought into sliding contact with each other, whereby an entire rod-side assembly can be slidingly moved in all directions with respect to the screw body. |
