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Optimal pin position in supraacetabular external fixation.

Renate Krassnig1, Gloria M Hohenberger2, Paul Schimmerl2

  • 1AUVA Rehabilitation Clinic Tobelbad, Tobelbad, Austria.

ANZ Journal of Surgery
|March 18, 2021
PubMed
Summary

Supraacetabular pin insertion differs significantly between sexes. Male pelves require longer Schanz screws and a steeper insertion angle compared to females, impacting external fixation techniques.

Keywords:
gender differencepelvic ring fracturepin positionsupraacetabular external fixation

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Area of Science:

  • Orthopedics
  • Anatomy
  • Medical Imaging

Background:

  • The supraacetabular pin is a critical component in pelvic external fixation.
  • Accurate placement is essential for effective fracture management and to avoid neurovascular injury.
  • Understanding anatomical variations, particularly gender-specific differences, is crucial for surgical planning.

Purpose of the Study:

  • To determine the optimal intraosseous length of the supraacetabular pin.
  • To analyze the ideal insertion angle in the transverse plane.
  • To investigate gender-specific differences in these parameters for supraacetabular pin placement.

Main Methods:

  • Analysis of 3D reconstructions from CT scans of 49 uninjured pelves.
  • Virtual placement of external fixator pins to measure length and insertion angle.
  • Statistical analysis including gender-specific comparisons (P < 0.05 significance).

Main Results:

  • Significant gender-based differences were observed in both pin length and insertion angle.
  • Male pelves: mean screw length 82.7 mm (range 72.9-94.3), mean angle 22.6° (range 12.4-31.8).
  • Female pelves: mean screw length 74.1 mm (range 63.1-81.9), mean angle 19.7° (range 11.7-24.5); both significantly different (P ≤ 0.001 and P = 0.0032, respectively).

Conclusions:

  • Schanz screw length and insertion angle for supraacetabular external fixators show statistically significant gender differences.
  • These findings are vital for tailoring surgical approaches in pelvic trauma management.
  • Informed pin placement can enhance the efficacy and safety of supraacetabular external fixation.