Modified end-to-side neurorrhaphy enhances axonal sprouting: a motor functional and morphological study

Area of Science:

• Neurosurgery
• Regenerative Medicine
• Peripheral Nerve Injury

Background:

• Peripheral nerve injuries often result in incomplete functional recovery.
• End-to-side neurorrhaphy is a surgical technique used to bridge nerve gaps.
• Modifications to neurorrhaphy techniques may improve nerve regeneration and functional outcomes.

Purpose of the Study:

• To evaluate the impact of modified end-to-side neurorrhaphy on functional recovery.
• To investigate the role of epineurial window and contact areas in nerve repair.
• To assess the enhancement of axonal sprouting and functional recovery through surgical modulation.

Main Methods:

• A modified end-to-side neurorrhaphy technique was employed in a rat model.
• The study utilized rat median nerve and finger flexor models.
• Functional recovery was assessed via grasping and muscle contractility tests 20 weeks post-surgery.
• Histological analysis was performed to evaluate nerve regeneration.

Main Results:

• The modified end-to-side neurorrhaphy significantly enhanced axonal sprouting from the intact donor nerve.
• Improved functional recovery was observed in grasping and muscle contractility tests.
• Histological examination confirmed increased nerve regeneration.
• Both epineurial window surface area and contact configuration were identified as critical factors.

Conclusions:

• Modified end-to-side neurorrhaphy promotes axonal sprouting and improves functional recovery after nerve injury.
• Surgical modulation of the epineurial window and contact areas is key to successful end-to-side nerve coaptation.
• This technique offers a promising approach for enhancing outcomes in peripheral nerve repair.