Risk factors and clinical significance of posterior slip of the proximal vertebral body after lower lumbar fusion

Figure 2 X-rays of a patient who underwent transforaminal lumbar interbody fusion surgery. A: Male, 51 years, lumbar disc herniation; B: postoperative X-ray: Pelvic incidence (PI) 57°, lumbar lordosis (LL) 59°, Lower lumbar lordosis 32°, |PI-LL| 2°, lordosis distribution index 54.2%; C: 27 months after the operation: Retrograde distance of cranial adjacent segments 4mm.