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.
