[Comparison of statics characteristics between anterior transpedicular screws system and vertebral body screws system in lower cervical spine].

Zhongguo gu shang = China journal of orthopaedics and traumatology

PubMedID: 24826474

Zhao LJ, Li J, Jiang WY, Xu RM, Ma WH, Qi F, Yu L, Zhang M, Wang YJ. [Comparison of statics characteristics between anterior transpedicular screws system and vertebral body screws system in lower cervical spine]. Zhongguo Gu Shang. 2014;27(2):118-22.
OBJECTIVE
To compare statics characteristics between anterior transpedicular screws (ATPS) system and vertebral body screws (VBS) system in lower cervical spine.

METHODS
Sixteen fresh cervical specimens were collected and dissected into 32 different units (functional spinal unit, FSU), 8 units in C3,4, C4,5, C5,6 and C6,7 each. The subjects were randomly divided into group A and B. The anterior transpedicular screw-plate system and anterior vertebral body screw-plate system were implanted separately in group A and B. Then, the maximum axial pull out strength was tested and compared between two fixation system.

RESULTS
Maximum pull out strength was (604.68 +/- 48.76) N in group A and (488.24 +/- 32.42) N in group B, and there was significant difference between two groups (t = 2.147, P < 0.05). There was no statistically significant difference in all FSU between anterior transpedicular screws system and vertebral body screws system (F(A) = 2.27, F(B) = 2.05, P > 0.05).

CONCLUSION
The pull out strength of anterior transpedicular screws system is better than vertebral body screws system, and the anterior transpedicular screws has the biomechanical feasibility in clinic.