A–D | E–G | H–J | K–M | N–Q | R–T | U–Z

H

Hemilaminectomy

The excision of only one side of the lamina (right or left) relative to other spinous process.

Herniated Intervertbral Disc (HID)

Extrusion of part of the nucleus pulposus material through a defect in the annulus fibrosus. Outpouching of a disc.

Herniated Nucleus Pulposus (HNP)

Extrusion of the central portion of an intervertebral disc through the outer cartilaginous ring. The material can compress the spinal cord or nerves in or exiting the spinal canal.

Herniation

Formation of a protrusion.

Humerus

The bone of the arm, articulating with the scapula above and the radius and ulna below.

Hydrocephalus

A condition, often congenital, marked by abnormal and excessive accumulation of cerebrospinal fluid in the cerebral ventricles. This dilates the ventricles and in infants and young children causes the head to enlarge.

Hydromyelia

Expansion of the spinal cord due to increased size of the central canal of the cord which is filled with CSF.

Hydroxyapatite (HA)

The lattice-like structure of bone composed of calcium and phosphorous crystals which deposits on collagen to provide the rigid structure of bone.

I

Iliac Bone

A part of the pelvic bone that is above the hip joint and from which autogenous bone grafts are frequently obtained.

Iliac Crest

The large, prominent portion of the pelvic bone at the belt line of the body.

Immobilization

Limitation of motion or fixation of a body part usually to promote healing.

Instrumentation

The use of instruments such as metal screws or braces during a surgical procedure to support bone as it heals.

Interbody

Between the bodies of two adjacent vertebrae.

Internal Fixation

The immobilization of bone fragments or joints with implants in order to promote healing or fusion.

Intervertebral Disc

See Disc (Intervertebral).

Intervertebral Disc Narrowing

Narrowing of the space between any two vertebral bodies.

Intracranial Pressure (ICP)

The overall pressure inside the skull.

Inferior

Situated below or directed downward.

Informed Consent

Consent of the patient who has received sufficient information to have surgery, receive medication, or participate in a clinical study.

J

Joint

The junction or articulation of two or more bones that permits varying.

A–D | E–G | H–J | K–M | N–Q | R–T | U–Z