| To discuss the value of discometry in cervical vertebral surgery by animal experiments and clinical exploratory development.1. To study the effect on intervertebral disc adjacent to operative segments by using cervical bioabsorbable cage or by using plate systems comparatively, without the intensity of brace by pressure monitoring on dog's intervertebral disc adjacent to operative segments. 23 dogs of medical fitness were included, and reference value of cervical intervertebral disc was measured by 5 dogs of force-empirical group. 18 empirical dogs were divide into 2 groups, group A (bioabsorbable cage devices, 9 dogs), and group B (plate systems, 9 dogs). All cases underwent anterior discectomy on C3/4, and were implanted with internal fixators. The pressure of intervertebral disc adjacent to operative segment (C4/5) was measured in the operation. The pressure change from preoperative to postoperative in group A and group B was calculated as the intensity of brace. There were no significant difference between group A and group B in pressure change of intervertebral disc adjacent to operative segments by t-test (P>0.05) . All animals were killed after 6 months. The degeneration degrees of intervertebral disc adjacent upon operative segments (C2/3) were evaluated by imaging (by Pearce standard) and histological study. We drew a conclusion as that exorbitant brace pressure can induce the degeneration on dog's intervertebral disc adjacent to operative segments, and the degeneration can be decreased by using bioabsorbable cage devices compared with plate systems.2. To analyze the relations of pressure change of intervertebral disc adjacent to fused segments and axial symptoms in ACDF (anterior cervical decompression and fusion), when lodorsis were maintained in all cases. 42 cases of traumas and diseases of cervical spine treated with anterior decompression, reconstruction and internal fixation by same doctors from January 2006 to January 2007 were included. The pressure of intervertebral disc next to fused segments was measured in the operation. The pressure change from preoperative to postoperative was calculated. The influences on restoration of cervical curvature were measured with D value (we drew a straight line from the posterior circumference of the dens to the posterior-inferior border of C7 and another line from the posterior-inferior border of C4 perpendicular to the first line, its length is D value), and the axial symptoms were observed at the same time. After 2-12 months follow-up (mean 6.5 months), we analyzed the relations of pressure change of intervertebral disc adjacent to fused segments and axial symptoms. It was indicated that there were affinities of pressure change of intervertebral disc adjacent to fused segments and axial symptoms in ACDF when lodorsis were maintained, and the pressure measure in the operation will help in control of the intensity of support, and axial symptoms can be decreased.3. To study the feasibility of discometry in radio frequency nucleuplasty, and discuss the influential factors of pressure changes in the intervertebral discs. 10 cervical cases (18 cervical discs) treated with radio frequency nucleuplasty with local anesthesia by same doctors from July 2006 to July 2007 were included. The pressures of operated intervertebral disc were measured in the operation. Another 5 cases (5 cervical discs) with disc contrast examine were random selected. The pressure changes from pre contrast examine to post contrast examine were calculated. The distribution of the pressure data of interveterbral disc, the pressure change, and the relation with contrast medium were analyzed by statistic methods. We drew a conclusion as that the pressure change of intervertebral disc had the close relation with radio frequency nucleuplasty and the using of contrast medium, and the feasibility of discometry in radio frequency nucleuplasty. Discometry will help in control of the degree of compression, and provide critical reference to ensure the curative effect.
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