| 摘要 |
A multi-axial screw assembly with a spherical landing surface is disclosed. The multi-axial screw assembly 100 includes a bone anchor 150 , a head 130 with a spherical outer surface and an extension member 160 extending from the top of the head 130 . The multi-axial screw is designed to attach a planar or semispherical end member of a plate to a vertebra. The plate is part of a spine fixation or stabilization assembly. The multi-axial screw provides multi-axial pivoting of the screw relative to the plate.
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