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Disc degeneration on lateral radiographs. Upon a comparison of disc degeneration before fusion and before non-fusion surgery and between each postoperative follow-up period, disc degeneration at L3-4 (*) was noted when comparing the state before the fusion surgery and that before the non-fusion surgery. After non-fusion dynamic stabilization surgery, disc degeneration gradually progressed, especially at L1-2 and L2-3.
