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Background:Protrusion of intervertebral disc was a clinical syndrom resulted from intervertevral disc degeneration, fibrous ring rupture,protrusion of pulpiform nucleus that stimulate and compresses nerve root,and comprehensive conservative therapy was often adopted.In this group of data,196 cases of protrusion of intervertebral disc treated by series of spinal balance therapy were collected from January 2000 to December 2001. rn