An intervertebral prosthetic disc is disclosed and can be installed within
an intervertebral space between an inferior vertebra and a superior
vertebra. The intervertebral prosthetic disc includes a superior
component that can be configured to engage the superior vertebra and an
inferior component that can be configured to engage the inferior
vertebra. A nucleus can be disposed between the superior component and
the inferior component. The nucleus can be configured to allow relative
motion between the superior component and the inferior component.
Further, the intervertebral prosthetic disc can include at least one
nucleus containment feature that can be configured to prevent the nucleus
from migrating with respect to the superior component and the inferior
component without interfering with the relative motion between the
superior component and the inferior component in any direction.