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Walterdebruyn et al: Effect of an Orthogonal Locking Plate and Primary Plate Working Length on Construct Stiffness and Plate Strain in an In vitro Fracture-Gap Model
Veterinary and Comparative Orthopedics and Traumatology 4, 2024

🔍 Key Findings Summary

  • Primary 3.5-mm LCP used with short (SWL), medium (MWL), and long (LWL) working lengths
  • Addition of orthogonal 2.7-mm LCP resulted in:
    • Significantly higher bending stiffness for SWL, MWL, and LWL (p < 0.0001)
    • Higher torsional stiffness for MWL and LWL (not for SWL)
    • Significantly lower strain across all working lengths in bending (p < 0.01)
  • Working length inversely related to construct stiffness and directly to plate strain
  • Orthogonal plates eliminated stiffness differences across working lengths in bending
  • Suggests orthogonal plates can improve implant fatigue life and allow compensation when short working lengths are unachievable

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← Articles

Walterdebruyn et al: Effect of an Orthogonal Locking Plate and Primary Plate Working Length on Construct Stiffness and Plate Strain in an In vitro Fracture-Gap Model
Veterinary and Comparative Orthopedics and Traumatology 4, 2024

🔍 Key Findings Summary

  • Primary 3.5-mm LCP used with short (SWL), medium (MWL), and long (LWL) working lengths
  • Addition of orthogonal 2.7-mm LCP resulted in:
    • Significantly higher bending stiffness for SWL, MWL, and LWL (p < 0.0001)
    • Higher torsional stiffness for MWL and LWL (not for SWL)
    • Significantly lower strain across all working lengths in bending (p < 0.01)
  • Working length inversely related to construct stiffness and directly to plate strain
  • Orthogonal plates eliminated stiffness differences across working lengths in bending
  • Suggests orthogonal plates can improve implant fatigue life and allow compensation when short working lengths are unachievable

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Multiple Choice Questions on this study

In Walter de Bruyn 2024 et al., what was the impact of orthogonal plate addition on torsional stiffness in medium and long working lengths?

A. No change
B. Increased significantly
C. Decreased slightly
D. Only in long length
E. Inconsistent results

Answer: Increased significantly

Explanation: Torsional stiffness increased significantly for MWL and LWL after adding orthogonal plates:contentReference[oaicite:2]{index=2}
In Walter de Bruyn 2024 et al., which of the following best explains the increased stiffness in orthogonal constructs?

A. Increased screw torque
B. Higher screw count per plate
C. Larger cross-sectional moment of inertia
D. Use of composite polymer bone
E. Less screw-bone motion

Answer: Larger cross-sectional moment of inertia

Explanation: Higher stiffness resulted from increased area and polar moment of inertia due to orthogonal plate placement:contentReference[oaicite:4]{index=4}
In Walter de Bruyn 2024 et al., what mechanical property was completely normalized across all working lengths after orthogonal plate application?

A. Strain
B. Torsional stiffness
C. Construct height
D. Bending stiffness
E. Yield torque

Answer: Bending stiffness

Explanation: Addition of orthogonal plates eliminated differences in bending stiffness across all working lengths:contentReference[oaicite:3]{index=3}
In Walter de Bruyn 2024 et al., how did orthogonal plate application affect strain in four-point bending?

A. Increased it
B. No effect
C. Only changed in long constructs
D. Decreased it
E. Only changed in short constructs

Answer: Decreased it

Explanation: Orthogonal plates significantly reduced plate strain across all working lengths in bending:contentReference[oaicite:1]{index=1}
In Walter de Bruyn 2024 et al., on orthogonal plate fixation, what was the effect of working length on construct stiffness?

A. No effect
B. Linear increase
C. Linear decrease
D. Inverse relationship
E. Quadratic increase

Answer: Inverse relationship

Explanation: Construct stiffness in both bending and torsion decreased incrementally as working length increased:contentReference[oaicite:0]{index=0}

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