| Objective A new type Atlantoaxial dynamic stabilization system were original designed based on the anatomic character of Chinese People. The biomechanics of the new dynamic stabilization system were investigated, to provide theoretical principle for clinic application and optimize design.Methods This study was divided in two Parts. Part one:The design and manufacture a new type Atlantoaxial dynamic stabilization system based on the anatomic character of100normal Chinese People through three dimension CT of upper cervical. Part two:Biomechanical study of the new type Atlantoaxial dynamic stabilization system.8fresh adult cervical spine (C0-C4) sample were made into four groups successively, include integrity status group,Unstable status group, dynamic stabilization system fixation group, pedicle screw fixation group. ROM of the segment and stiffness were tested by mechanical test machine. Compared with integrity status respectively, analyzed the influence to the ROM of the stabilized segment, motion function and influence of adjacent segment. The consequence were analyzed by statistics.Results The Atlantoaxial dynamic stabilization system is in accordance with the feature cervical spine of Chinese People. The biomechanical study shows the ROM of Cl/2in integrity status group and dynamic stabilization system fixation group under various models such as flexion, extension, Lateral bending and rotation was no significant difference (P>0.05), integrity status group and pedicle screw fixation group under various models was obvious significant difference (P<0.001),dynamic stabilization system fixation group, and pedicle screw fixation group under various models was obvious significant difference (P<0.001). The ROM of C2/3in integrity status group and dynamic stabilization system fixation group under various models such as flexion, extension, Lateral bending and rotation was no significant difference (P>0.05), integrity status group and pedicle screw fixation group under various models was obvious significant difference (P<0.001),dynamic stabilization system fixation group, and pedicle screw fixation group under various models was obvious significant difference (P<0.001). Consequence of stability and stiffness also illustrated the advantage of dynamic stabilization system.Conclusion A new type of dynamic stabilization system can provide an sufficient biomechanical stability, and correspond with characteristic of Chinese people anatomy. The new type of dynamic stabilization system not only can recover stability of Cl/2,but retain the motion function of C1/2,and decrease influence to the adjacent segment effectively. |
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