orthosis
[or-tho´sis] (Gr.) an orthopedic appliance or apparatus used to support, align, prevent, or correct deformities or to improve function of movable parts of the body. See also
brace and
splint.
cervical orthosis a rigid plastic orthosis that encircles the neck and supports the chin and the back of the head; used in the treatment of injuries to the cervical spine.

Cervical orthoses. A, Soft foam collar. B, Firm plastic collar.

Cervical orthoses offering rigid support to the cervical spine: A, Halo-type cervical orthosis attached to a polyethylene jacket. B, Four poster orthosis.
dynamic orthosis an orthosis that both gives support and aids in the initiation and performance of movement by a body part.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.