A 69-year-old man presents to clinic with 9 months of worsening back and lower extremity pain that is worse with walking. Pain is improved by sitting down and leaning forward. He has attempted physical therapy without improvement in symptoms. A T2-weighted midline sagittal image is shown in Figure A. A T2-weighted axial image at the L4/5 disc space is shown in Figure B. A flexion and extension lateral radiograph are shown in Figure C and D. Performing a lumbar decompressive laminectomy alone at L4/5 will lead to which of the following?