Fig. 5

Typical case 2: A 76-year-old female presented with low back discomfort and right lower limb numbness for more than 2 years, which aggravated for 1 week. Diagnosis of L4-5 spinal stenosis. L4-5 single segment OLIF combined with posterior L4-5 percutaneous internal fixation was performed. 2a, 2b Anteroposterior and lateral X-ray films of lumbar spine before operation showed lumbar degeneration. 2c Preoperative sagittal T2 MRI of the lumbar spine showed severe spinal stenosis at L4-5 segment. RNRs was seen above the stenosis plane. 2d Postoperative sagittal T2 MRI of the lumbar spine showed that the RNRs above the L4-5 surgical segment disappeared. 2e, 2f Axial T2 MRI of lumbar spine before and after operation showed that the dural sac CSA increased significantly after OLIF indirect decompression. 2g, 2h At the last follow-up, the X-ray film of the lumbar spine showed that the L4-5 pedicle screw was fixed, the cage was placed in the middle and the position was good, and the height of the L4-5 intervertebral space was recovered well