Systems and methods for controlling motion and physiologic load sharing across a functional spinal unit defined by a pair of adjacent vertebrae and an intervertebral disc therebetween are provided. The systems may comprise a first component for repairing or replacing a disc nucleus, without substantially disrupting the annulus. A second component may be provided for attachment to the adjacent vertebrae, the second component being configured to control movement of the vertebrae relative to one another. The first and second components may be configured to cooperate simultaneously to control motion and collectively distribute physiologic load sharing across the functional spinal unit.
