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Deprey et al: Mechanical evaluation of a novel angle‐stable interlocking nail in a gap fracture model
Veterinary Surgery 8, 2022

🔍 Key Findings

  • NAS-ILN had significantly greater stiffness in both axial compression and 4-point bending compared to LCP constructs.
  • Ultimate load to failure was significantly higher for NAS-ILN in compression (804 N vs 328 N) and bending (25.7 Nm vs 16.3 Nm).
  • Torsional stiffness and angular deformation were similar, but NAS-ILN resisted higher torque to failure than LCP (22.5 Nm vs 19.1 Nm).
  • No slack was observed with the NAS-ILN construct, unlike older nail designs.
  • Failure modes differed: LCPs failed via plate bending; NAS-ILNs failed at the implant or bone near screw holes.
  • Titanium alloy and curved design of NAS-ILN provides better anatomic fit and more uniform stress distribution.
  • A third, perpendicular locking hole in NAS-ILN may enhance torsional stability but was not utilized in this study.
  • The curved, angle-stable design of NAS-ILN is a novel advancement in veterinary orthopedics.

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← Articles

Deprey et al: Mechanical evaluation of a novel angle‐stable interlocking nail in a gap fracture model
Veterinary Surgery 8, 2022

🔍 Key Findings

  • NAS-ILN had significantly greater stiffness in both axial compression and 4-point bending compared to LCP constructs.
  • Ultimate load to failure was significantly higher for NAS-ILN in compression (804 N vs 328 N) and bending (25.7 Nm vs 16.3 Nm).
  • Torsional stiffness and angular deformation were similar, but NAS-ILN resisted higher torque to failure than LCP (22.5 Nm vs 19.1 Nm).
  • No slack was observed with the NAS-ILN construct, unlike older nail designs.
  • Failure modes differed: LCPs failed via plate bending; NAS-ILNs failed at the implant or bone near screw holes.
  • Titanium alloy and curved design of NAS-ILN provides better anatomic fit and more uniform stress distribution.
  • A third, perpendicular locking hole in NAS-ILN may enhance torsional stability but was not utilized in this study.
  • The curved, angle-stable design of NAS-ILN is a novel advancement in veterinary orthopedics.

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Multiple Choice Questions on this study

In Deprey 2022 et al., on gap fracture implants, which construct had significantly lower axial deformation in compression testing?

A. LCP construct
B. NAS-ILN construct
C. Both were equal
D. The synthetic bone model
E. Neither construct

Answer: NAS-ILN construct

Explanation: The NAS-ILN had significantly lower axial deformation in axial compression testing compared to the LCP.
In Deprey 2022 et al., on gap fracture implants, which construct demonstrated higher torque to failure during torsional testing?

A. LCP construct
B. Bone-only construct
C. NAS-ILN construct
D. Bone plate rod construct
E. None; all failed similarly

Answer: NAS-ILN construct

Explanation: The NAS-ILN resisted significantly more torque before failure than the LCP construct in torsional testing.
In Deprey 2022 et al., on gap fracture implants, what was the failure mode of the LCP constructs under axial compression?

A. Fracture at the screw holes
B. Implant rupture at nail's distal hole
C. Plate bending at open screw holes
D. Fracture of the bone segments
E. Nail bending at the fracture gap

Answer: Plate bending at open screw holes

Explanation: The LCP constructs failed by plate bending at the screw holes in compression testing.
In Deprey 2022 et al., on gap fracture implants, which material was the NAS-ILN made of?

A. Titanium alloy
B. 316 LVM stainless steel
C. Carbon fiber composite
D. Cobalt-chromium alloy
E. Aluminum alloy

Answer: Titanium alloy

Explanation: The NAS-ILN was made from titanium alloy (Ti6Al-4V ELI), offering favorable biomechanics and biocompatibility.
In Deprey 2022 et al., on gap fracture implants, which of the following best explains the improved biomechanical performance of the NAS-ILN?

A. Central bone alignment, angle-stability, and titanium alloy material
B. Eccentric alignment and use of stainless steel
C. Use of external fixators with the LCP
D. Bone healing rate measured over 6 weeks
E. Use of anatomic locking plate

Answer: Central bone alignment, angle-stability, and titanium alloy material

Explanation: NAS-ILN advantages include central positioning, threaded angle-stable screw fixation, and use of titanium alloy.

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