| 摘要 |
The present invention provides a system, device, instruments and methods for improving the holding strength and purchase of a screw in the body, preferably a screw in bone, preferably a vertebral bone. In one embodiment an allograft tissue form configured for placement between a preformed hole preferably through a pedicle and into the interior of a vertebral body is provided to receive a pedicle screw that is to be introduced through the allograft tissue form. Embodiments include monolithic allograft tissue forms, multi-piece allograft tissue forms, distally expandable portions, partially and fully demineralized portions, and flexible connecting portions. Advantages of the allograft tissue forms of the present invention include improved pedicle screw blackout strength. Methods for making and instruments and techniques for inserting the augmentation device, system and pedicle screws are also disclosed. |
