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Published on: March 23, 2022
A new cervical nerve root avulsion model using a posterior extra-vertebral approach in rats
Takashi Noguchi1, Souichi Ohta, Ryosuke Kakinoki
1Department of Orthopaedic Surgery, Graduate School of Medicine, Kyoto University, 54 Shogoinkawahara-cho, Sakyo-ku, Kyoto City, Kyoto 606-8507, Japan. sota@kuhp.kyoto-u.ac.jp.
Journal of Brachial Plexus and Peripheral Nerve Injury
|September 12, 2013
Summary
A new extravertebral avulsion technique for studying cervical nerve root injury in rats is simpler and safer than traditional methods. This reproducible procedure effectively models motoneuron death, aiding research into nerve root avulsion.
Area of Science:
- Neuroscience
- Surgical Techniques
- Spinal Cord Injury Research
Background:
- Nerve root avulsion injuries decrease spinal cord motor neurons.
- Intradural avulsion procedures are standard but technically challenging and risky.
- A novel cervical nerve root avulsion method was developed and validated.
Purpose of the Study:
- To introduce and assess a new, simpler extravertebral nerve root avulsion technique in rats.
- To compare the efficacy and safety of the new method against existing procedures.
- To investigate motoneuron survival and spinal cord changes following the novel avulsion.
Main Methods:
- A posterior approach was used, avulsing the C6 nerve root externally without intradural manipulation.
- Surgical success was confirmed by nerve root stump morphology and cerebrospinal fluid leakage.
- Motoneuron survival rates were compared across four groups: intradural avulsion, intradural rhizotomy, extravertebral avulsion, and extravertebral rupture.
Main Results:
- The extravertebral avulsion procedure was easier and caused less spinal cord damage.
- Motoneuron survival rates were significantly lower in the extravertebral avulsion group (47.5%) compared to extravertebral rupture (98.9%) and intradural rhizotomy (77.1%).
- Histological analysis revealed intraspinal bleeding, glial reactions, and macrophage infiltration in the extravertebral avulsion group.
Conclusions:
- The developed extravertebral avulsion procedure is simple, reproducible, and safe.
- This technique provides a valuable tool for studying cervical nerve root avulsion injuries.
- The method facilitates research into motoneuron death mechanisms after nerve root avulsion.