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Schematic drawings showing that dominance of the contralateral findings may be related to traction forces in some patients. a When the projection of the apex is at the midpoint of the base of a disk herniation, the traction generated on both nerve roots is expected to be equal. b However, when the apex of herniation is deviated laterally, the traction generated on the contralateral nerve root is more than that on the ipsilateral nerve root
