[A static mechanical comparison between two transarticular internal fixation techniques in the lower cervical spine]

Area of Science:

• Orthopedic Surgery
• Biomechanical Engineering
• Spinal Fusion Techniques

Background:

• Internal fixation is crucial for stabilizing lower cervical spine injuries.
• Evaluating novel fixation methods is essential for improving patient outcomes.
• Transarticular screw techniques offer potential for enhanced cervical spine stability.

Purpose of the Study:

• To compare the static mechanical properties of transarticular pedicle screws versus standard transarticular screws.
• To assess the biomechanical differences in fixation strength within the lower cervical spine (C3-T1).

Main Methods:

• Ten human cadaveric cervical spine specimens were utilized.
• Transarticular pedicle screws and transarticular screws were placed on contralateral sides at C3-4, C5-6, and C7-T1 levels.
• Axial pullout testing was performed using a servohydraulic testing machine to determine load-displacement curves.

Main Results:

• Transarticular pedicle screws exhibited a mean pullout strength of 668 N.
• Standard transarticular screws showed a mean pullout strength of 414 N (P < 0.05).
• No significant difference in pullout strength was observed between different cervical levels (P > 0.05).

Conclusions:

• Transarticular pedicle screws provide superior static mechanical strength compared to transarticular screws.
• Transarticular pedicle screw fixation demonstrates biomechanical feasibility for clinical application in the lower cervical spine.