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Author Question: Imaging the L5-S1 joint with an AP projection requires the CR to be directed: perpendicular 15 ... (Read 74 times)

OSWALD

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on: Jul 17, 2018
Imaging the L5-S1 joint with an AP projection requires the CR to be directed:
 
 perpendicular
  15 degrees cephalic
  30 degrees cephalic
  20 degrees cephalic

Question 2

Which positioning error occurred if the zygapophyseal joint isn't perfectly visible and the intervertebral foramen are starting to align?
 
 overrotation
  the patient's spine wasn't parallel
  underrotation
  no error occurred


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aburgess

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Reply #1 on: Jul 17, 2018
Answer to Question 1

30 degrees cephalic

Rationale: The L5-S1 AP axial projection requires a 30 degree cephalic tube angle to aid in opening up the joint space.

Answer to Question 2

overrotation

Rationale: The pedicle should be nearly centered on the vertebral body to indicate proper rotation was achieved. Underrotation will result with the pedicle still anterior on the vertebral body. Overrotation will result with the pedicle too posterior on the vertebra.


OSWALD

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Reply 2 on: Jul 17, 2018
YES! Correct, THANKS for helping me on my review

elyse44

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Reply 3 on: Yesterday
Great answer, keep it coming :)

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