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The effect of applying the normal sacral nerve root to repair the sacral plexus root avulsion was stud ied.Thirty rats were divided into three groups ran domly (n =10).To establish the right avulsion model of sacral nerve root injury in group Ⅰ.the proximal ending of left L6 was sutured to the distal end of right L5 in group Ⅱ.the proximal ending of left L6 was sutured to the distal end of right L6 in group Ⅲ.