Fig. 6

Typical case 3: A 74-year-old male presented with numbness in both lower limbs for more than 1 year, aggravated for 1 week. Diagnosis of L4-5 spinal stenosis with L4 vertebral 1 degree spondylolisthesis. L4-5 single segment OLIF combined with posterior L4-5 percutaneous internal fixation was performed. 3a, 3b Anteroposterior and lateral X-ray films of the lumbar spine before operation showed lumbar degeneration and I ° spondylolisthesis of L4 vertebral body. 3c Preoperative sagittal T2 MRI of the lumbar spine showed L4-5 spinal stenosis, no RNRs above the stenosis plane. 3d Postoperative sagittal T2 MRI of the lumbar spine showed no RNRs above the L4-5 surgical segment. 3e, 3f Axial T2 MRI of lumbar spine before and after operation showed that the dural sac CSA increased significantly after OLIF indirect decompression. 3g, 3h At the last follow-up, the X-ray film of the lumbar spine showed that the L4-5 pedicle screw was fixed, good reduction of L4-5 spondylolisthesis, the fusion cage was placed in a good position, and the height of the L4-5 intervertebral space was well restored