Related Experiment Videos
"Donor" muscle structure and function after end-to-side neurorrhaphy.
P S Cederna1, L K Kalliainen, M G Urbanchek
1Department of Surgery, Institute of Gerontology, University of Michigan Health Systems, Ann Arbor, Michigan, USA. cederna@umich.edu
Plastic and Reconstructive Surgery
|April 20, 2001
Summary
End-to-side neurorrhaphy acutely causes partial denervation in donor muscles but does not cause long-term structural or functional deficits. This peripheral nerve reconstruction technique is safe for donor muscles over time.
Area of Science:
- Neurosurgery
- Peripheral Nerve Regeneration
- Muscle Physiology
Background:
- End-to-end nerve coaptation is standard for peripheral nerve repair.
- End-to-side neurorrhaphy is an alternative when proximal stumps are unavailable.
- Potential adverse effects on donor muscles are not well-understood.
Purpose of the Study:
- To investigate the acute and chronic effects of end-to-side neurorrhaphy on donor muscle innervation and function.
- To test the hypotheses of acute denervation and no chronic deficits in donor muscles.
Main Methods:
- Adult Lewis rats underwent end-to-side neurorrhaphy or sham procedures.
- Acute study (2 weeks): Isometric force and NCAM staining of extensor digitorum longus muscle.
- Chronic study (6 months): Contractile properties of medial gastrocnemius muscle.
Main Results:
- Acutely, a fivefold increase in denervated muscle fibers was observed (p < 0.001), with no force deficits.
- Chronically, no differences in muscle contractile properties were found between groups.
- Data support hypotheses regarding acute denervation and chronic safety.
Conclusions:
- End-to-side neurorrhaphy causes acute axonal disruption and partial denervation of donor muscles.
- Long-term structural and functional deficits in donor muscles are not observed.
- This technique is a viable option for peripheral nerve reconstruction without compromising donor muscle function.