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.
