ABSTRACT
Five groups of six rats each underwent sciatic resection, bridged with a 20-mm-long
graft. Five different types of graft were used: (1) vein; (2) fresh muscle; (3) denatured
muscle; (4) vein and fresh muscle; and (5) vein and denatured muscle. Denaturation
was obtained by dry thermal shock in a microwave oven. Morphologic analysis took place
at 6 months. The macroscopic appearance of the graft was continuous in all type 4
and 5 animals. Morphometric analysis within the graft revealed a significantly greater
number of fibers in type 3 animals. Average fiber diameter and g ratio were higher,
although not significantly, in type 5 animals. Distal to the graft, average fiber
diameter and g ratio were significantly higher in type 5 rats.
Denaturation by exposure to thermal shock significantly improves axonal regeneration,
both quantitatively and qualitatively. The regeneration rate seems to be more rapid
within denatured muscle. Denaturing muscle by exposure to thermal shock provides an
excellent guide for axonal regrowth, but axonal leaks may occur. This problem is solved
by a muscle-in-vein graft technique.
KEYWORD
Nerve substitute - nerve graft - vein and muscle