Mechanical properties of acellular peripheral nerve

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Neurosurgery

Background:

• Acellular nerve grafts are explored as potential substitutes for peripheral nerve repair.
• Understanding the mechanical properties of acellular nerve is crucial for its clinical application.

Purpose of the Study:

• To compare the tensile strength of fresh and chemically treated acellularized peripheral nerves.
• To evaluate mechanical differences in whole and repaired nerve constructs.

Main Methods:

• F344 rat sciatic nerves were prepared as fresh or acellularized grafts.
• Nerve constructs were tested mechanically, assessing ultimate stress, strain, Young's modulus, and work to fracture.
• Two testing groups: whole nerve (Part A) and transected and repaired nerve (Part B).

Main Results:

• Acellularized nerves (Group A-2) showed higher ultimate strain (0.810) and work to failure (1.11 N) compared to fresh nerves (Group A-1: 0.480 strain, 0.35 N work).
• However, fresh nerves (Group B-1) demonstrated significantly higher ultimate stress (780 kPa) than repaired acellular nerves (Group B-2: 405 kPa).
• Young's modulus was higher in fresh nerves for both whole (576 kPa vs 580 kPa) and repaired (4030 kPa vs 2290 kPa) configurations, though less pronounced in whole nerves.

Conclusions:

• Acellular peripheral nerve possesses adequate robustness for reconstructive purposes.
• Chemically treated acellular nerve exhibits diminished tensile strength relative to fresh nerve.
• These mechanical deficits are observed in both whole nerve and repaired nerve configurations.