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Does Posterior Fixation of Partially Unstable Open-Book Pelvic Ring Injuries Decrease Symphyseal Plate Failure? A

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Adding an iliosacral screw to symphyseal plating did not improve biomechanical outcomes for open-book pelvic injuries. Further research with larger sample sizes is needed to detect any potential small effects in treating these specific pelvic ring disruptions.

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Area of Science:

  • Orthopedic surgery
  • Biomechanics
  • Trauma research

Background:

  • Anteroposterior compression type-2 (APC-2) pelvic ring injuries are partially unstable.
  • Clinical studies suggest potential benefits of iliosacral screws for APC-2 injuries.
  • Biomechanical data on iliosacral fixation for APC-2 injuries are limited.

Purpose of the Study:

  • To biomechanically evaluate the addition of an iliosacral screw to symphyseal plating for APC-2 pelvic injuries.
  • To determine if supplemental iliosacral fixation reduces pelvic displacement in a cadaver model.

Main Methods:

  • Human cadaveric pelves underwent simulated APC-2 injury creation.
  • Specimens were treated with either symphyseal plating alone or plating plus an iliosacral screw.
  • Pelvic displacement was measured under cyclic loading.

Main Results:

  • No significant difference in pelvic displacement was observed between the two fixation groups.
  • No implant failures occurred in the tested specimens.
  • Post hoc analysis indicated a small effect size, requiring a large sample size to detect differences.

Conclusions:

  • Supplemental iliosacral screw fixation does not enhance biomechanical stability in APC-2 pelvic injuries compared to symphyseal plating alone.
  • Clinical stress examination may guide decisions for supplemental posterior fixation in APC-2 injuries.