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Review Question - QID 24

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QID 24 (Type "24" in App Search)
A 39-year-old male is thrown from his motorcycle into a fast-food restaurant and sustains a closed pelvic ring injury. During placement of percutaneous iliosacral screws, the outlet radiograph in Figure A is obtained. What purpose does this view serve?
  • A

Evaluation of possible injury to L5 nerve root

10%

135/1382

Evaluation of anterior-posterior position of screw(s)

10%

142/1382

Best visualization of sagittal curvature of sacral ala

5%

66/1382

Best visualization of spinal canal

1%

20/1382

Best visualization of sacral neural foramina

73%

1008/1382

  • A

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Figure A shows an intraoperative outlet view, which provides the best visualization of the neural foramina (and possible screw placement into these foramina). This view provides information regarding cephalad-caudad placement of the screw, whereas the inlet view provides information regarding the anterior-posterior position of the screw. The lateral sacral view provides information regarding the sagittal curvature of the sacral ala and gives information regarding possible iatrogenic L5 nerve injury as it goes over the sacral ala.

The referenced article by Routt et al is a review article regarding the safety and techniques of percutaneous pelvic ring fixation.

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