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Bae et al: Effect of thread direction on rotational stability in lag​-screw fixation of sacroiliac luxation: An ex vivo cadaveric study in small-breed dogs
Veterinary Surgery 2, 2025

🔍 Key Findings

  • Ex vivo study using 24 canine cadaver pelves to test screw thread direction in SI luxation.
  • Four groups: RhRSI, RhLSI, LhRSI, LhLSI.
  • Right-handed screws on right side (RhRSI) had 313% higher torque and 274% higher load vs left side (p < .01).
  • Left-handed screws on left side (LhLSI) had 198% higher torque and 195% higher load vs right side (p < .03).
  • All failures occurred due to rotation, with no screw breakage or fractures.
  • Body weight and moment arm were similar across groups.
  • Clinical implication: Use of screw matching handedness to luxation side improves stability.

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How critical is this paper for crushing the Boards?

🚨 Must-know. I’d bet on seeing this.

📚 Useful background, not must-know.

💤 Skip it. Doubt it’ll ever show up.

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