A posterior structure of a vertebra which articulates with a facet of an adjacent vertebra to form a facet joint that allows motion in the spinal column. Each vertebra has two superior and two inferior facets.

Excision of a facet.

A fracture that occurs in bone or in other materials. Including metal, as a result of repeated stress as opposed to a single injury.

The replacement of normal tissue with scar tissue.

"Soft spots" of the infant's head, normal unossified areas in the infant skull.

The Federal government agency that has regulatory authority over the manufacture, distribution, and labeling of drugs, medical devices, and foods.

A natural opening or passage in bone.

Surgical opening or enlargement of the bony opening transversed by a nerve root as it leaves the spinal cord.

A disruption of the normal continuity of bone.

Surgery intended to improve the function of the central nervous system. Astereotactic head frame is used along with imaging techniques to map the brain and localize the surgical target.

Union or healing of bone (see Arthrodesis).