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Review Question - QID 217395

Atlas Fractures & Transverse Ligament Injuries Techniques Posterior C1-C2 fusion QID: 217395 (OBQ21.76)
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QID 217395 (Type "217395" in App Search)
A 63-year-old male patient with a history of rheumatoid arthritis presents with neck pain that has progressively worsened. Flexion and extension radiographs are depicted in figure A. The decision is made to treat the patient with C1-2 posterior instrumented fusion with a Goel-Harms construct. The patient is found to have osteoporosis preoperatively and the treating surgeon decides to place bicortical C1 lateral mass screws. During the screw placement, a 10° medial trajectory is used for the screws. What structure is avoided with this screw trajectory?
  • A
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  • A