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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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← Articles

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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Multiple Choice Questions on this study

In Bae 2025 et al., on SI screw orientation, what was the observed failure mode in all specimens?

A. Screw breakage
B. Sacral fracture
C. Screw pull-out
D. Rotational failure
E. Ilial fracture

Answer: Rotational failure

Explanation: All constructs failed via rotation only, with no screw breakage or fractures reported.
In Bae 2025 et al., on SI screw orientation, how much greater was peak torque in RhRSI compared to RhLSI?

A. About 100% greater
B. About 150% greater
C. About 200% greater
D. About 240% greater
E. About 300% greater

Answer: About 240% greater

Explanation: RhRSI had 67.55 N cm vs 28.14 N cm for RhLSI, approximately 2.4-fold difference (p < .01).
In Bae 2025 et al., on SI screw orientation, what clinical recommendation arises from the findings?

A. Always use right-handed screws
B. Use left-handed screws on right SI
C. Use right-handed screws on both SI joints
D. Match screw handedness to luxation side
E. Thread direction has no clinical impact

Answer: Match screw handedness to luxation side

Explanation: Using left-handed screws on the left and right-handed screws on the right yielded superior rotational resistance.
In Bae 2025 et al., on SI screw orientation, which parameter did NOT differ significantly among groups?

A. Yield torque
B. Peak load
C. Moment arm
D. Yield load
E. Maximum torsional force

Answer: Moment arm

Explanation: Moment arm measurements showed no significant differences (p = .82), ensuring fair comparison of torque outcomes.
In Bae 2025 et al., on SI screw orientation, which screw-side combination yielded the highest rotational stability?

A. Left-handed screw on right SI
B. Right-handed screw on left SI
C. Left-handed screw on left SI
D. Right-handed screw on right SI
E. Right-handed screw on both sides

Answer: Right-handed screw on right SI

Explanation: Right-handed screws on right SI (RhRSI) had the highest torque and load values (e.g., 313% more torque vs RhLSI, p < .01).

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