6. Spine MCQs

A spine surgeon is performing a transforaminal endoscopic lumbar discectomy at the L4-L5 level. The endoscopic working channel is safely placed through Kambin’s triangle. What are the true anatomical borders of this safe zone?

A spine surgeon is performing a transforaminal endoscopic lumbar discectomy. Instruments are passed through Kambin's triangle to access the disc space while minimizing neural injury. Which of the following structures forms the posterior boundary of this anatomical working zone?

A 45-year-old woman undergoes an anterior cervical discectomy and fusion (ACDF) at the C6-C7 level via a right-sided transverse incision. Postoperatively, she is noted to have profound hoarseness. The affected nerve is more susceptible to injury on the right side compared to the left due to which of the following anatomical characteristics?

A spine surgeon is performing a transforaminal endoscopic lumbar discectomy at the L4-L5 level. The instruments are safely advanced through Kambin's triangle to access the disc space. What anatomical structure forms the anterior (ventral) boundary of this working zone?

During posterior spinal fusion for scoliosis, a surgeon places a thoracic pedicle screw at the T7 level. The surgeon must be acutely aware of the anatomic relationship of the exiting nerve root to the pedicle to prevent neurologic injury. The T7 nerve root exits the neural foramen in which position relative to the T7 pedicle?

A 60-year-old female is undergoing an L4-L5 posterior spinal fusion with instrumentation for degenerative spondylolisthesis. During the placement of L4 pedicle screws using a freehand technique, the surgeon must identify the correct starting point. Which of the following best describes the anatomical landmark for the ideal starting point for an L4 pedicle screw?

A spine surgeon is performing a posterolateral lumbar fusion at L4-L5 with pedicle screw fixation. When placing a pedicle screw into the right L4 pedicle, the surgeon must be cautious of the surrounding neural elements. What is the normal anatomical relationship of the L4 nerve root to the L4 pedicle?

During posterior cervical instrumentation, a spine surgeon prepares to place C1 lateral mass screws. To avoid catastrophic vascular injury, the surgeon must be acutely aware of the course of the vertebral artery in this region. Immediately after exiting the C1 transverse foramen, the vertebral artery typically lies in which position before entering the foramen magnum?

A 62-year-old man presents with severe radicular leg pain. Magnetic resonance imaging reveals a far lateral (extraforaminal) disc herniation at the L4-L5 level. Which of the following nerve roots is most likely to be compressed by this specific herniation?

During an anterior cervical discectomy and fusion (ACDF), the surgeon dissects laterally toward the uncinate processes. Extreme lateral dissection poses a risk of catastrophic injury to the vertebral artery. In the majority of the population, at what cervical level does the vertebral artery enter the foramen transversarium as it ascends toward the brain?

When performing a standard anterior approach to the cervical spine, the surgeon encounters the recurrent laryngeal nerve. Which of the following accurately describes its typical anatomical course?

When placing lumbar pedicle screws using standard open anatomical landmarks, what is the accepted entry point?

During a transforaminal endoscopic lumbar discectomy, the surgeon navigates instruments through Kambin's triangle to safely access the disc space. Which of the following structures forms the anterior border of Kambin's triangle?

The lateral femoral cutaneous nerve (LFCN) is at risk during anterior pelvic approaches. In the most common anatomical variant, where does the LFCN pass in relation to the anterior superior iliac spine (ASIS) and inguinal ligament?

When placing a pedicle screw in the lumbar spine, the anatomic starting point is best described as the intersection of the:

During a right-sided anterior approach to the lower cervical spine (C5-C7), a structure that loops from lateral to medial is at risk of iatrogenic injury, potentially leading to vocal cord paralysis. Around which vascular structure does this nerve loop?

When placing lateral mass screws in the subaxial cervical spine (C3-C6) using the Magerl technique, the drill is directed 25 degrees outward (laterally) and 25 degrees upward (cephalad) to primarily avoid injury to which two structures?

During a microdiscectomy at the L4-L5 level via a traditional posterior interlaminar approach, the surgeon encounters a large paracentral disc herniation. Anatomically, which nerve root is most commonly compressed by this specific herniation, and where does it ultimately exit the spinal canal?

During an anterior cervical discectomy and fusion (ACDF) at the C5-C6 level, the surgeon develops the standard plane between the carotid sheath laterally and the trachea/esophagus medially. Which of the following specific fascial layers must be incised to enter this internervous plane?

The transpsoas lateral approach to the lumbar spine places the lumbar plexus at significant risk of iatrogenic injury. At the L4-L5 disc space level, where is the lumbar plexus most consistently located within the psoas major muscle?