Abstract: ObjectiveTo explore the clinical effect of short segment fixation combined with fenestration in the treatment of degenerative instability L3 degree Ⅰ spondylolisthesis with lumbar spinal stenosis disease. MethodsThirtynine patients who suffered from degenerative instability L3 degree Ⅰ spondylolisthesis with lumbar spinal stenosis were treated with short segment fixation combined with fenestration. Operative bleeding volume、 operation time、 complication occurrence were observed. Japanese Orthopedic Association(JOA)score was adopted to evaluate postoperative effec. Periodic observation with radiographic imaging, postoperative internal fixation、fusion of bone and slippage of the segment after surgery were examined. ResultsObserved indicators were as follows: operative bleeding volume was(400.0±80.6) mL，operation time was(133.0±28.4) min, complication occurrence was 2/29. The symptoms were relieved obviously in the group of patients after the operation. with higher JOA scores．The position of nail stick system was good, without cage subsidence, displacement and increasement in slip. Six months after operation, lumbar fusion between L3 and L4 was good except one case. ConclusionShort segment fixation combined with Posterior limited spinal decompression in the treatment of degenerative instability L3 degree Ⅰ spondylolisthesis with lumbar spinal stenosis has advantages of minimal invasion, retains part of the spinal mobility, alleviates the economic burden of the patient, and shows good effects.

Key words: spinal stenosis, arthrodesis, spondylolysis