Is C1 Asymmetric Laminectomy Safer? A Cadaver Study

Area of Science:

• Neurosurgery
• Anatomy
• Surgical Safety

Background:

• Cervical spine surgery, particularly C1 laminectomy, carries risks of vertebral artery injury.
• Understanding anatomical variations is crucial for minimizing surgical complications.

Purpose of the Study:

• To compare C1 laminectomy dimensions on the right and left sides.
• To assess the impact of vertebral artery dominance on safe surgical corridors.
• To reduce complication risks associated with C1 posterior arcus decompression.

Main Methods:

• Cadaveric study involving five male Caucasian specimens.
• Measurement of C1 posterior tubercle to vertebral groove distance (A).
• Measurement of vertebral groove length (B) and vertebral artery diameter.
• Statistical analysis and CT scan evaluation.

Main Results:

• The vertebral groove was significantly longer on the side of the dominant vertebral artery.
• Mean distance A: Right 20.20±2.168 mm, Left 16.40±2.881 mm.
• Mean groove length B: Right 13.80±0.8367 mm, Left 17.60±0.8944 mm.

Conclusions:

• Safe C1 laminectomy areas vary based on vertebral artery dominance.
• Shorter decompression extent is recommended on the dominant artery side.
• Asymmetric decompression is advised to mitigate vertebral artery injury risk during C1 decompression.