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Muroi et al: Stress Changes in the Canine Radius after Locking Plate Fixation Using Finite Element Analysis
Veterinary and Comparative Orthopedics and Traumatology 3, 2024

🔍 Key Findings Summary

  • Finite element analysis compared intact radii vs. locking plates placed 1 mm or 3 mm above the bone
  • LP placement significantly reduced tensile (maximum principal) stress on cranial cortex, potentially causing implant-induced osteoporosis
  • Shell element findings:
    • Max principal stress significantly lower in both LP groups vs. intact (p < 0.05)
  • Solid element findings:
    • Equivalent stress higher and max principal stress lower in LP groups
  • Implication: Tension reduction may impair bone remodeling; implant design and placement height affect stress environment

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← Articles

Muroi et al: Stress Changes in the Canine Radius after Locking Plate Fixation Using Finite Element Analysis
Veterinary and Comparative Orthopedics and Traumatology 3, 2024

🔍 Key Findings Summary

  • Finite element analysis compared intact radii vs. locking plates placed 1 mm or 3 mm above the bone
  • LP placement significantly reduced tensile (maximum principal) stress on cranial cortex, potentially causing implant-induced osteoporosis
  • Shell element findings:
    • Max principal stress significantly lower in both LP groups vs. intact (p < 0.05)
  • Solid element findings:
    • Equivalent stress higher and max principal stress lower in LP groups
  • Implication: Tension reduction may impair bone remodeling; implant design and placement height affect stress environment

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Multiple Choice Questions on this study

In Muroi 2024 et al., on radius plate stress effects, what was the yield load measured during mechanical testing of cadaveric radii?

A. 260 N
B. 780 N
C. 1,260 N
D. 1,890 N
E. 2,310 N

Answer: 1,260 N

Explanation: Mechanical testing showed yield load was 1,260 N at 55.5% of the distal radius.
In Muroi 2024 et al., on radius plate stress effects, what FEA result was consistent in both LP 1 mm and 3 mm groups?

A. Reduced minimum principal strain
B. Reduced maximum principal strain
C. Reduced compressive stress on caudal aspect
D. Reduced tensile stress on cranial aspect
E. Increased strain on radial diaphysis

Answer: Reduced tensile stress on cranial aspect

Explanation: Maximum principal stress decreased significantly at cranial cortex in both LP groups.
In Muroi 2024 et al., on radius plate stress effects, how did the 1 mm and 3 mm elevated locking plate groups differ in equivalent stress versus intact controls?

A. Both LP groups showed significantly higher equivalent stress
B. Both LP groups showed significantly lower equivalent stress
C. Only the 3 mm group had higher equivalent stress
D. No difference in equivalent stress
E. Equivalent stress was lower in LP 1 mm group only

Answer: Both LP groups showed significantly higher equivalent stress

Explanation: FEA with solid elements revealed higher equivalent stress in LP groups vs. intact, p < 0.05.
In Muroi 2024 et al., on radius plate stress effects, what was the significant effect of locking plate (LP) placement on cranial cortical bone stress?

A. It increased maximum principal stress
B. It decreased minimum principal stress
C. It increased compressive strain
D. It significantly decreased tensile (maximum principal) stress
E. It had no measurable effect on stress

Answer: It significantly decreased tensile (maximum principal) stress

Explanation: FEA showed LP placement reduced maximum principal (tensile) stress significantly on the cranial cortex.
In Muroi 2024 et al., on radius plate stress effects, what clinical implication is suggested regarding implant-induced osteoporosis (IIO)?

A. It arises from elevated strain
B. It is due to increased callus formation
C. It is unrelated to stress shielding
D. It may result from reduced cortical tension beneath LP
E. It is only caused by necrosis

Answer: It may result from reduced cortical tension beneath LP

Explanation: Study concludes IIO and bone changes may stem from reduced tension on plated cortex.

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