Fig. 1From: Oblique lateral internal fusion combined with percutaneous pedicle screw fixation in severe lumbar spinal stenosis: clinical and radiographic outcomeOLIF surgery procedure. A The psoas muscle was exposed (*, psoas major muscle). B The operative space was dilated with the retractors (*, intervertebral disc space). C The huge OLIF cage is filled with allografts. D The postoperative incisionBack to article page