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Between 1980 and 1985, 147 patients with lumbar disc herniations were treated by discectomy and/or foraminotomy.,We investigated preoperative clinical and myelographic findings. Lasegue's sign was positive in 50% of cases.It was positive more frequency in younger patients.Diagnosis of the clinical level of L % disc herniation was more accurate than of L, S, disc herniation.The average sagittal diameter of all dural tubes was 13. 8mm and that of the dural tubes with complete block was 11. 6mm.Ventral defect of L 44 disc herniation was larger than that of L 5, S 1 disc herniation.

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