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| JIANG Weiyu,YU Liang,MA Weihu.The efficacy of posterior atlanto-axial dynamic fixation system, an experimental study[J].Chinese Journal of Spine and Spinal Cord,2013,(12):1097-1100. |
| The efficacy of posterior atlanto-axial dynamic fixation system, an experimental study |
| Received:April 18, 2013 Revised:July 30, 2013 |
| English Keywords:Atlanto-axial Dynamic fixation system Effectiveness Biomechanics |
| Fund:浙江省医药卫生科技计划项目（编号：2011RCB034）；浙江省自然科学基金项目（编号：LY02H06001） |
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| English Abstract: |
| 【Abstract】 Objectives： To test the efficacy of self-designed posterior dynamic fixation system． Methods： According to the anatomic features and routine posterior pedicle screw technique of atlanto-axial vertebrae, a posterior atlanto-axial dynamic fixation system was designed, and its effectiveness was tested. Eight human cadaveric specimens(C0-C4) under test were subgrouped as: the intact group(group A), instable group(group B), posterior atlanto-axial dynamic fixation group(group C) and posterior atlanto-axial pedicle screw fixation group(group D). The three dimensional ranges of motions of C1 relative to C2 under loading of ±1.5N·M were measured under flexion/extension, left and right lateral bending, and left and right axial rotation． The obtained data were statistically analyzed. Results： The results showed that: (1)the difference between group B and A in ROM of flexion/extension, left/right lateral bending and rotation was 41%, 44% and 9%, respectively, with significant differences(P<0.05); the difference between group C and B in ROM was 46%, 50% and 17%, respectively, with significant differences(P<0.001); the difference between group D and B in ROM was 62%, 70% and 61%, respectively, with significant differences(P<0.001). (2)the difference between group C and A in ROM of flexion/extension, left/right lateral bending and rotation was 8%, 9% and 9%, respectively, with no significant differences(P>0.05). (3)the difference between group D and A in ROM of flexion/extension, left/right lateral bending and rotation was 35%, 46% and 58%, respectively, with significant differences(P<0.001); and compared with group C, the difference was 30%, 41% and 53% respectively, which showed significant differences(P<0.001). Conclusions： The posterior atlanto-axial dynamic fixation is effective for atlanto-axial dislocation and instability, as well as maintaining the ROM of C1-C2. |
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