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More Than Epineurium Deep: Characterizing Peripheral Nerve Damage Using High-Resolution Micro-Computed Tomography for

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High-resolution imaging revealed that traumatic nerve lacerations extend beyond visual surgical assessment. This underappreciated internal nerve damage, particularly from table saw injuries, impacts surgical repair and nerve regeneration potential.

Keywords:
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Area of Science:

  • Peripheral nerve surgery
  • Regenerative medicine
  • Diagnostic imaging

Background:

  • Assessing nerve damage from acute traumatic lacerations is challenging.
  • Clinical evaluation relies on visual inspection of the epineurium and nerve ends, often under magnification.
  • Internal fascicular damage is not readily apparent, yet crucial for nerve regeneration.

Purpose of the Study:

  • To characterize the extent of nerve damage from common traumatic lacerations using a novel high-resolution imaging method.
  • To compare imaging-based damage assessment with visual estimation by experienced surgeons.

Main Methods:

  • Twelve human upper extremity cadaveric specimens were used.
  • Simulated lacerations using a knife, broken glass, and table saw.
  • Compared visual estimations of nerve damage with micro-computed tomography measurements.

Main Results:

  • Fascicular disruption extended beyond visual assessment by an average of 7.8–12.1 mm.
  • Table saw lacerations showed the most extensive nerve damage.
  • Radiographic damage was underestimated in all injury types.

Conclusions:

  • Internal nerve damage from traumatic lacerations is underappreciated by surgeons.
  • Table saw injuries result in the most significant nerve damage.
  • Further investigation is needed to understand the impact of underestimated damage on nerve regeneration.