Lumbar microdiscectomy: analysis of 100 consecutive cases. Its pitfalls and final results

100 consecutive microsurgically operated patients suffering lumbar prolapsed disc are analyzed in the present work. Three different groups have been distinguished. Under and over forty years of age, and patients operated on after chemonucleolysis failure. General results after all treatments have been 76% good result, 17% improvement and 7% worsening. Special remark should be given about the chemonucleolysis group, that has a highest worsening percentage which raises 25% of the group patients.