An intervertebral device includes a first plate having an outer face and
an inner face, and a second plate juxtaposed with the first plate, the
second plate having an outer face, an inner face that opposes the first
plate and a concavity that opposes the first plate. The device includes
an elongated member extending from the first plate toward the second
plate, the elongated member having a distal end with a spherical surface
that is engageable with the concavity of the second plate for providing
an articulating joint between the first and second plates. The device
also includes a resilient member extending at least partially around and
being in contact with the elongated member for counteracting compressive
loads on the plates, the resilient member being surrounded by the
concavity of the second plate.