X-ray dynamic observation of cervical degenerative disease induced by unbalanced dynamic and static forces in rats 1.

PURPOSE: To investigate dynamically the X-ray appearance of cervical degenerative disease induced by unbalanced dynamic and static forces in rats.

METHODS: A total of 60 Sprague Dawley rats were randomized into test (n=45) and control (n=15) groups, which were randomly subdivided into the one-, three- and six-month post-operative groups. The test group included 10, 15 and 20 rats at the respective corresponding post-operative stage and the control group included five rats at each time-point. By excising cervicodorsal muscles, interspinous ligaments and supraspinous ligament of rats in the test group, the balance of dynamic and static forces on cervical vertebrae was disrupted to establish a rat model of cervical degeneration. Spinal X-ray images were acquired, and intervertebral disc space and intervertebral foramen size were measured at one, three and six months post-operation. The results were analyzed and compared among groups.

RESULTS: Cervical dynamic and static imbalance accelerated the appearance of cervical degenerative disease on X-ray.

CONCLUSION: Cervical degenerative disease may be induced by unbalanced dynamic and static forces in rats.