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Objective To investigate whether there is morphological change at intervertebral disc after traction therapy to lumbar disc protrusion. Methods We observed 58 lumbar disc protrusion cases diagnosed by CT and treated with traction therapy with CT again, and compared morphological change of intervertebral disc on CT image before and after treatment. Result Effective rate of traction therapy to lumbar disc protrusion was 84.48% , there was no apparent difference in degree of lumbar disc protrusion, anterior posterior diameter of vertebral canal and lateral crypt width between before and after treatment. Conclusion Traction can relieve effectively clinical symptoms of lumbar disc protrusion, but cant make great change in shape of protruded intervertebral disc.