| 摘要 |
<p>A polyaxial bone anchor has a headless anchor member (e.g., a screw, hook, or other structure for attaching to bone) that allows the size of the bone anchor to be small. A locking element securely snap-fits over the headless anchor member such that inadvertent separation from the anchor member is unlikely. When the anchor member is attached to the locking element and the locking element is seated within the anchor head of the bone anchor, the headless anchoring member can polyaxially rotate about a central axis of the bone anchor before being locked in place.</p> |
