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[Biomechanical study on transarticular screw and plate fixation syetem in the lower cervical spine]
Guan-Yi Liu1, Rong-Ming Xu, Wei-Hu Ma
1Department of Orthopaedics, Sixth Hospital of Ningbo, Ningbo 315040, Zhejiang, China. lgysimon@yahoo.com.cn
Objective:
To compare the cervical stabilities of transarticular screw fixation alone, and transarticular screw and plate fixation system.
Methods:
Twelve specimens of cervical vertebra containing C2-T1 were obtained from human cadaver. The three-column instability model was made at C4.5 and C5.6 levels. The specimens were stabilized with transarticular screw fixation alone, and transarticular screw and plate fixation system respectively. The ranges of motion of segments including intact group, transarticular screw fixation alone group and transarticular screw and plate fixation system group were measured under the torque of 2.0 N x m in flexion, extension, lateral bending, and torsion respectively under nonrestrictive and nondestructive condition.
Results:
The rang of motion (ROM) and neutral zone (NZ) of both transarticular screw fixation alone and transarticular screw and plate fixation system group were significantly smaller than those of intact group in all directions (P < 0.05). The transarticular screw and plate fixation system group allowed a very smaller ROM and NZ than transarticular screw fixation alone during extension, lateral bending and axial rotation except flexion (P < 0.05).
Conclusion:
Cervical transarticular screw and plate fixation system provides better stability than transarticular screw fixation alone. If the transarticular fixation technique is preferred, transarticular screw and plate fixation system will be beneficial.
