Fig. 4From: Comparing oblique lumbar interbody fusion with lateral screw fixation and percutaneous endoscopic transforaminal discectomy (OLIF-PETD) and minimally invasive transforaminal lumbar interbody fusion (MIS-TLIF) for the treatment of lumbar disc herniation complicated with lumbar instabilityX-ray related index measurement. A, B Preoperative lumbar hyperextension and flexion lateral radiographs showed a change in intervertebral space angulation greater than 10°, which was consistent with the diagnosis of lumbar instability. C Lumbar lateral radiography DH measurement DH = (AH + PH)/2. D Lumbar lateral radiography LA measurement. E FSA measurement on lateral lumbar radiographyBack to article page