Initial observations on using magnesium metal in peripheral nerve repair

Area of Science:

• Biomaterials Science
• Neuroscience
• Regenerative Medicine

Background:

• Peripheral nerve injuries pose significant challenges to regeneration.
• Biodegradable nerve conduits are being explored to bridge nerve gaps.
• Magnesium's properties suggest potential as a biodegradable implant material.

Purpose of the Study:

• To evaluate the resorption and biocompatibility of biodegradable magnesium filaments within nerve conduits.
• To assess the impact of magnesium filaments on peripheral nerve regeneration in a rat model.
• To investigate the influence of different conduit filler substances on magnesium degradation.

Main Methods:

• Repair of 6 mm sciatic nerve gap injuries in Lewis rats using poly(caprolactone) conduits with or without magnesium filaments.
• Conduits were filled with either saline or keratin hydrogel.
• Magnesium degradation assessed via micro-computed tomography and histology at 6 weeks.
• Biocompatibility evaluated through histological and immunocytochemical analyses.
• Functional recovery assessed by gastrocnemius muscle size.

Main Results:

• Magnesium degradation was significantly higher in conduits filled with keratin hydrogel compared to saline.
• Magnesium filaments demonstrated good biocompatibility with minimal inflammation and supported nerve mini-fascicle development.
• Complete magnesium degradation did not impede nerve regeneration.
• A slight functional improvement was noted with magnesium filaments and saline filler.

Conclusions:

• Biodegradable magnesium filaments are biocompatible and resorbable within nerve conduits.
• Magnesium implants show promise for enhancing peripheral nerve repair.
• Further research is warranted to optimize magnesium's role in nerve regeneration strategies.