Abstract
Stimulating silver plate being buried in the neighboring spinal neck muscles and insensitive electrode silver plate in the lower back region, intermittent electric impulses were given to rabbits which had received the prevertebral fixations conducted from the anterior aspect of the cervical vertebrae using staple in a total of about 180 frequencies for 10 minutes daily by about 18 frequencies per minute by means of the low frequency therapeutic apparatus in order to make automatic hyperextension of the cervical vertebrae.
Histological examinations revealed that was the backward displacement of the nucleus pulposus with the posterior protrusion of the intervertebral disk. From author's experimental results herniation took place in only one case of the 3 weekgroup, this indicating that the typical hernia of the nucleus pulposus reported so far is considered to appear extremely rarely.
