Lowest number of brachial plexus nerve roots required for maintaining normal limb function--an experimental study

Area of Science:

• Neuroscience
• Surgical Research

Background:

• Brachial plexus root avulsion is a severe injury requiring complex reconstructive surgery.
• Identifying suitable donor nerves is critical for successful nerve grafting and functional recovery.

Purpose of the Study:

• To evaluate the functional impact of using single or multiple contralateral brachial plexus nerve roots as donors in a rat model.
• To determine the safety and efficacy of different nerve root division strategies for potential clinical application.

Main Methods:

• 252 Sprague-Dawley rats were allocated into 13 groups based on single, double, or triple nerve root division.
• Post-operative assessment included electroneurophysiology and muscular histology at two weeks and two months.
• Functional limb recovery was monitored to assess the impact of nerve root division.

Main Results:

• Single nerve root division resulted in no apparent limb damage.
• Division of non-adjacent double nerve roots caused temporary limb dysfunction, with recovery by two months.
• Division of adjacent double nerve roots or three nerve roots led to persistent limb dysfunction.

Conclusions:

• Dividing a single nerve root of the brachial plexus is a viable option with minimal functional deficit.
• Careful selection of non-adjacent nerve roots may be feasible for nerve grafting without permanent limb impairment.
• Division of adjacent double nerve roots or multiple nerve roots poses a risk of long-term functional deficits.