The Yale cervical orthosis is a lightweight polyethylene foam Philadelphia collar with molded fiberglass extensions over the thorax. This orthosis was studied on 17 normal subjects in the extremes of the ranges of flexion, extension, rotation, and lateral bending using roentgenograms and axial photographs to assess how effectively it limited motion of the neck. Overall, it satisfactorily controlled cervical motion and was similar to the most effective rigid cervical orthoses. Flexion and extension ranges were compared at different segmental levels of the spine. The Yale orthosis was most successful in restricting flexion in the area of the middle and lower cervical spine and was acceptable in controlling extension range. The orthosis was least effective in controlling motion in the upper spine, particularly at the atlantoaxial articulation. The Yale orthosis is recommended for postsurgical protection of the middle and lower cervical spine and in select situations of spinal instability, but it is not recommended for control of odontoid fractures or atlantoaxial subluxation.
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