| 摘要 |
A spinal interbody or intravertebral device is provided for fusion and non-fusion spinal applications. The spinal interbody device allows for limited motion between adjacent vertebrae to help preserve normal motion between adjacent vertebrae (superior/inferior vertebrae) relative to the implanted spinal interbody device and limited rotational motion of the spinal interbody device, once implanted. Limitation of motion is achieved through one or more protrusions incorporated into the spinal interbody device. The protrusions preferably, but not necessarily, extend radially from a hub or ball-shaped body of the interbody device. In one form, a single protrusion extends radially about the hub of the interbody device to form a continuous band, ring or base about the hub. In this form, portions of the band may extend radially further from the hub than other portions of the band. Preferably, but not necessarily, in this form the band extends radially a greater distance from the hub in the posterior and anterior directions. In another form, a first protrusion extends radially from one side of the hub while a second protrusion extends radially from another side of the hub. Anchoring means may also be provided for attachment to upper and lower vertebrae.
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