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Biomechanical Evaluation of an Anterior Upper Thoracic Plate Fixation System: An In Vitro Human Cadaveric Study
Chunxiang Xiong1, Juli Luo2, Dong Yin3
1Co Culture of Post-doctoral Research Center of People's Hospital of Guangxi Zhuang Autonomous Region and Post-doctoral Mobile Station of Clinical Medicine of Shanxi Medical University, Nanning, Guangxi, People's Republic of China; Department of Orthopedics, The People's Hospital of Guangxi Zhuang Autonomous Region, Nanning, Guangxi, People's Republic of China.
Objective:
This study aimed to evaluate the biomechanical characteristics of the anterior upper thoracic plate fixation system (AUTP).
Methods:
Twelve specimens were divided into 2 groups: the AUTP group and the anterior cervical locking plate (ACLP) group. Bone mineral density was assessed in all specimens. The specimens were loaded with pure bending moments of ±4 Nm to move toward extension/flexion, right/left lateral tilt, and right/left axial rotation. Each specimen was tested in 3 load cycles under 3 conditions (native, destabilized, and torsion). The tightening moments were assessed in every screw using a torsion meter.
Results:
The tightening moment of the AUTP screws was more pronounced than the ACLP (P < 0.05). Significant decreases after stabilization with the AUTP compared with the native situation were observed in the AUTP group (P < 0.05). In terms of the direction of lateral tilt and torsion, the neutral zone increased significantly after stabilization with the AUTP compared with the native situation (P < 0.05).
Conclusions:
The AUTP was shown to provide more rigidity to the destabilized spine than the ACLP.
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