RESUMEN
<p><b>OBJECTIVE</b>To explore operative effect of lumbar intervertebral disc herniation accompanying with lumbar instability.</p><p><b>METHODS</b>Form June 2000 to June 2006, 46 patients of lumbar intervertebral disc herniation accompanying with lumbar instability were treated with decompression through posterior approach, diskectomy, spinal fusion and vertebral pedicle internal fixation. Including 33 males and 13 females,the age was from 37 to 68 years with an average of 48 years. The course of disease was from 4 months to 20 years with an average of 3.5 years. There were simple segment in 21 cases, double segments in 22 cases, three segments in 3 cases.</p><p><b>RESULTS</b>All patients were followed up for 12-45 months with an average of 25 months. All cases got solid fusion and clinical symptom improved obviously. According to clinical standard to evaluation, 32 cases obtained excellent result, 8 good, 6 fair. The rate of excellent and good was 86.9%.</p><p><b>CONCLUSION</b>Diskectomy, spinal fusion and internal fixation can obtain satisfactory clinical effect for lumbar intervertebral disc herniation accompanying with lumbar instability.</p>