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Thirty-nine-year-old male, 309 pounds. One-year history of lower back and left buttocks discomfort. Single functional spine unit (FSU) involved. Unresponsive to conservative care. Treated with hemi-laminectomy at L4-5 and single-level dynamic stabilization. Axial (A) and saggital (B) T2-weighted MR images showing degeneration of the L4-5 intervertebral disc. Three-month postoperative films of extension (C) and flexion (D) demonstrate motion at the dynamically stabilized level.
