| 摘要 |
A screw is configured to be inserted into an aperture of a plate. The screw comprises a head, a neck that extends distally from the head and having a diameter, a shoulder that extends distally from the neck and has a diameter, and a shaft that extends distally from the shoulder and has a thread, a major diameter and a minor diameter. The diameter of shoulder is larger than the diameter of the neck and larger than the minor diameter of the shaft. |
