Motion Effects on Blood Flow of the Vertebral Artery and Width of Cervical Intervertebral Foramina
In six cadaver specimens flow measurements in the vertebral artery were performed in varying degrees of flexion/extension. The measurement was restricted to the pars vertebralis. Best flow was found at a position of moderate flexion (1/3 of maximum flexion).
The width of the intervertebral foramen of the cervical spine increased with flexion and decreased with extension. Taking the size at neutral position as 100%, it was 126.9% at final flexion and 77.4% at final extension.
The clinical relevance of this data was tested in a prospective randomized trial, using two cervical collars. One of them forces the cervical spine into moderate flexion. This orthosis proved to be of superior aid in conservative treatment of cervical syndromes.
KeywordsCervical Spine Vertebral Artery Neutral Position Motion Effect Cervical Collar
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