Improving C1-C2 Complex Fusion Rates: An Alternate Approach.

Area of Science:

• Neurosurgery
• Orthopedic Surgery
• Spinal Fusion Techniques

Background:

• Atlantoaxial instability (AAI) poses surgical challenges due to C1-C2 junction abnormalities.
• Current fusion techniques have suboptimal rates (<40%) and may require sacrificing the C2 nerve root, increasing complication risks.
• Spinal cord injury prevention is paramount in AAI surgical repair.

Purpose of the Study:

• To evaluate a novel surgical technique for C1-C2 fusion in patients with atlantoaxial instability.
• To assess the fusion rates and complication profile of this alternative arthrodesis method.
• To demonstrate a safe and reliable technique for C1-C2 instability repair.

Main Methods:

• Retrospective analysis of 87 patients undergoing C1-C2 surgical fusion (2001-2008).
• Utilized bilateral C1 lateral mass and C2 pedicle screws with intra-articular arthrodesis.
• C1-C2 joint accessed by superior retraction of the C2 nerve root, packed with autologous bone.

Main Results:

• Achieved 100% C1-C2 joint fusion in all 87 patients.
• Mean follow-up of three years showed complete fusion.
• Two patients experienced occipital headaches due to C1 screw impingement, resolved by hardware removal after confirmed fusion.

Conclusions:

• The described intra-articular arthrodesis technique is a safe and reliable method for C1-C2 fusion.
• This approach offers biomechanical advantages and avoids C2 nerve root resection, minimizing risks of vertebral artery or spinal cord injury.
• 100% fusion success rate suggests this technique is highly effective for treating atlantoaxial instability.