Biomechanical study of C1-C2 posterior arthrodesis techniques

Area of Science:

• Orthopedic Surgery
• Spinal Biomechanics
• Neurosurgery

Background:

• Cervical spine fusion is crucial for stabilizing injuries.
• Various fixation techniques exist, each with unique biomechanical properties.
• Comparing the stability of different cervical fusion constructs is essential for clinical decision-making.

Purpose of the Study:

• To compare the rotational and translational stability of three cervical spine fusion constructs: Brooks fusion, Halifax interlaminar clamps, and Gallie fusion.
• To evaluate the biomechanical performance of these fixation methods in cadaveric specimens.

Main Methods:

• Fifteen human cadaveric cervical spines were utilized for biomechanical testing.
• Rotational and translational stability were assessed for Brooks fusion, Halifax interlaminar clamps, and Gallie fusion constructs.
• Statistical analysis was performed to determine significant differences in stiffness.

Main Results:

• Both Brooks and Halifax clamp constructs demonstrated significantly greater rotational and translational stiffness than the Gallie construct (P < 0.001).
• The Halifax clamp construct showed greater rotational stiffness and equivalent translational stiffness compared to the Brooks construct (P < 0.05).
• Brooks and Halifax constructs offered superior fixation but posed technical challenges; Gallie fusion was less demanding but less stable.

Conclusions:

• Brooks and Halifax interlaminar clamp constructs provide superior rotational and translational stability for cervical spine fusion compared to the Gallie construct.
• While Halifax clamps offer enhanced rotational stability over Brooks fusion, both present technical difficulties.
• The Gallie construct is technically simpler but yields less stable cervical spine fixation.