Design and In Vivo Testing of an Anatomic 3D-Printed Peripheral Nerve Conduit in a Rat Sciatic Nerve Model

Area of Science:

• Biomedical Engineering
• Regenerative Medicine
• Neuroscience

Background:

• Three-dimensional (3D) printing is increasingly used in medicine, especially orthopedics.
• Peripheral nerve repair often necessitates grafts or conduits to bridge nerve gaps.
• Current methods like autografts, allografts, and synthetic conduits have limitations.

Purpose of the Study:

• To improve nerve regeneration by developing a 3D-printed scaffold mimicking nerve topography.
• To compare the efficacy of topography-based scaffolds against traditional cylindrical conduits.
• To address limitations of existing nerve repair strategies and axonal dispersion.

Main Methods:

• Created a 3D scaffold based on rat sciatic nerve topography using histology and CAD.
• 3D printed both topographical scaffolds and cylindrical conduits.
• Implanted scaffolds in 12 rats, comparing outcomes with contralateral controls using functional and histological analyses.

Main Results:

• No significant differences were found between topographical scaffolds and cylindrical conduits in histological outcomes.
• Functional assessments, including the Sciatic Functional Index (SFI), showed no significant differences.
• Muscle force and electrophysiology (EMG) results were comparable between the two groups.

Conclusions:

• 3D-printed topographical scaffolds are feasible for sciatic nerve regeneration in a rat model.
• The study highlights the potential of mimicking anatomical topography for nerve repair.
• Further research is necessary to optimize these scaffolds and validate functional outcomes.