Pre-operative x-rays demonstrated a Grade I degenerative spondylolisthesis with instability on flexion-extension radiographs (Figures 1, 2). MRI findings (Figure 3) revealed disc bulging and uncovering of the intervertebral disc in addition to spondylolisthesis.
Figure 1. Standing flexion x-ray from the side (lateral); bending forward at the waist
Figure 2. Standing extension x-ray from the side (lateral); bending backward
Figure 3. Lateral MRI demonstrates spondylolisthesis at L4-L5
Figure 4. Lateral x-ray
Figure 5. Post-operative lateral x-ray at 6 months after spine surgery. The interbody device can be seen between the fourth and fifth lumbar vertebral bodies (L4-L5)