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Glossary - H


Harrington rod:  An old type of spinal instrumentation used to correct scoliosis.


health maintenance organization:  A type of insurance coverage for medical care in which all care is given by a group of doctors who are under contract to provide services at a reduced fee.


herniated disc:  A lumbar intervertebral disc in which a portion of the nucleus pulposus has moved to an abnormal position.


hologram:  A three-dimensional image projection.