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Miller et al: Mechanical Testing of Sliding on Pivot-Locking Clamp (SOP-LC) Fracture Repair System in Four-Point Bending and Torsion
Veterinary and Comparative Orthopedics and Traumatology 4, 2024

🔍 Key Findings Summary

  • No significant difference in mechanical properties between contoured vs non-contoured SOP-LC rods
  • Clamp configuration significantly influenced mechanical performance:
    • Single-side clamps → ↑ yield load, ↑ displacement, ↑ bending strength (p < 0.05)
    • Alternating-side clamps → ↑ initial torsional stiffness (p = 0.029)
  • Clamp slippage was evident only in torsional tests; screw loosening may be torque-dependent
  • Mild screw bending and construct offset suggest subtle instability
  • Recommends clamp configuration choice based on loading scenario
  • Suggests 3.0 Nm torque may be more effective than 2.5 Nm to prevent clamp slippage

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← Articles

Miller et al: Mechanical Testing of Sliding on Pivot-Locking Clamp (SOP-LC) Fracture Repair System in Four-Point Bending and Torsion
Veterinary and Comparative Orthopedics and Traumatology 4, 2024

🔍 Key Findings Summary

  • No significant difference in mechanical properties between contoured vs non-contoured SOP-LC rods
  • Clamp configuration significantly influenced mechanical performance:
    • Single-side clamps → ↑ yield load, ↑ displacement, ↑ bending strength (p < 0.05)
    • Alternating-side clamps → ↑ initial torsional stiffness (p = 0.029)
  • Clamp slippage was evident only in torsional tests; screw loosening may be torque-dependent
  • Mild screw bending and construct offset suggest subtle instability
  • Recommends clamp configuration choice based on loading scenario
  • Suggests 3.0 Nm torque may be more effective than 2.5 Nm to prevent clamp slippage

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Multiple Choice Questions on this study

In Miller 2024 et al., on SOP-LC mechanical testing, what was the impact of rod contouring on four-point bending strength?

A. Significantly increased strength
B. Significantly decreased strength
C. No significant change
D. Reduced stiffness only
E. Only affected yield torque

Answer: No significant change

Explanation: Contoured versus non-contoured rods did not differ significantly in bending strength, stiffness, or displacement.
In Miller 2024 et al., on SOP-LC mechanical testing, how did single-side clamp placement affect bending strength compared to alternating sides?

A. Increased strength and yield load
B. Decreased torsional resistance only
C. No significant difference
D. Only affected structural stiffness
E. Reduced screw strain

Answer: Increased strength and yield load

Explanation: Single-side clamps increased bending strength, yield displacement, and load significantly.
In Miller 2024 et al., on SOP-LC mechanical testing, which configuration improved initial torsional stiffness?

A. Contoured rod configuration
B. Single-side clamp placement
C. Alternating clamp placement
D. Increased torque to 3.0 Nm
E. Uniform rod surface finish

Answer: Alternating clamp placement

Explanation: Alternating clamps significantly improved torsional stiffness despite lower bending strength.
In Miller 2024 et al., on SOP-LC mechanical testing, what complication was associated with torsional loading?

A. Screw pullout from bone
B. Catastrophic rod fracture
C. Clamp slippage
D. Screw shearing at midpoint
E. Cortical bone crushing

Answer: Clamp slippage

Explanation: Clamp slippage occurred in torsion tests but not in bending, suggesting fixation instability.
In Miller 2024 et al., on SOP-LC mechanical testing, what torque value may help reduce clamp slippage during use?

A. 1.5 Nm
B. 2.0 Nm
C. 2.5 Nm
D. 3.0 Nm
E. 4.0 Nm

Answer: 3.0 Nm

Explanation: The study suggests that increasing torque from 2.5 to 3.0 Nm may improve clamp stability and reduce slippage.

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