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J Reconstr Microsurg 2001; 17(5): 347-356
DOI: 10.1055/s-2001-16027
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Copyright © 2001 by Thieme Medical Publishers, Inc., 333 Seventh Avenue, New York, NY 10001, USA. Tel.: +1(212) 584-4662

The Fate of Neurotization Techniques on Reinnervation after Denervation of the Gastrocnemius Muscle: An Experimental Study

Ibrahim Askar1 , Bizden Tavil Sabuncuoglu2 , Erdem Yormuk3 , Aydin Saray4
  • 1Department of Plastic and Reconstructive Surgery, Dicle University Medical School, Diyarbakir, Turkey
  • 2Department of Histology and Embryology, Ankara University Medical School, Ankara, Turkey
  • 3Department of Plastic and Reconstructive Surgery, Ankara University Medical School, Ankara, Turkey
  • 4Department of Plastic and Reconstructive Surgery, Mersin University Medical School, Mersin, Turkey
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Publication History

Publication Date:
31 December 2001 (online)

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ABSTRACT

In nerve injuries, if it is not possible to reinnervate muscle by using neurorrhaphy and nerve grafting technique, reinnervation should be provided by the use of neuroization-directly implanting motor nerve into muscle. A comparative study of three techniques of neurotization is presented in rabbits.

In this experimental study, a total of 40 white New Zealand rabbits were used and divided into four groups, each including 10 rabbits. In the first group (control-Group 1), only surgical exposure of the gastrocnemius muscle, main muscle nerve (tibial nerve), and peroneal nerve was done, without any injury to the nerves. In the second group (direct neurotization group-Group 2), the tibial nerve was transected, and the peroneal nerve, which had already been divided into fascicles, was implanted into the lateral head of the gastrocnemius muscle aneural zone. In the third group (dual neurotization group-Group 3), the tibial nerve which had been transected and re-anastomosed, and the peroneal nerve were implanted into the lateral head of the gastrocnemius muscle. In the last experimental group (hyperneurotization group-Group 4), fascicles of the peroneal nerve were implanted into the lateral head of the gastrocnemius, preserving the tibial nerve. Six months later, changes in the histologic pattern and the functional recovery of the gastrocnemius muscle were investigated. It was found that functional recovery was achieved in all neurotization groups.

Groups with the tibial nerve transected had less muscular weights than those of groups with the tibial nerve intact. EMG recordings showed that polyphasic and late potentials were frequently seen in groups with the tibial nerve transected. Degeneration and regeneration of myofibrils was observed in such groups as well. New motor end-plates, including vesicles, were formed in a scattered manner in all neurotization groups.

As a result, the authors conclude that direct and dual neurotization techniques are useful in peripheral nerve injuries, if it is not possible to reinnervate muscle by using neurorraphy and nerve grafting, and that there is no suggested superiority among these techniques.

KEYWORD

Neurotization - denervation and reinnervation - gastronuemius muscle - experimental

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