Biomechanical evaluation of a novel atlas polyaxial transverse connecting screw system, an in vitro human cadaveric study
Yun-Lin Chen, Wen-Jie Lu, Yu-Li Ma, Wei-Hu Ma, Wei-Yu Jiang- General Medicine
Purpose:
To introduce a novel transverse connecting screw system, and to evaluate the biomechanical stability of the novel screw system using human cadaveric specimens.
Methods:
Six fresh-frozen cadaveric upper cervical spines were used in our study. Every specimen was tested under 5 conditions: intact group; unstable group; C1 to C2 screw rod system group; C1 to C2 + crosslink system group; atlas polyaxial transverse connecting screw (APTCS) system.
Results:
Compared with the intact state, C1 to C2 screw rod system, C1 to C2 + CL system and APTCS showed statistically decrease range of motion in all directions except for the unstable group under posterior extension direction (
Conclusion:
The APTCS system was able to restore stability to the atlantoaxial joint. APTCS system has the advantages of easy installation, convenient bone grafting, and strong biomechanical strength.