Although it did not reach statistical significance, the superior disc migration tended to be higher in the upper lumbar level (61.9% in the L1–2, L2–3, or L3–4 levels), while the inferior disc migration tended to be higher in the lower lumbar level (57.5% in the L4–5 or L5–S1 level; p = 0.1426, Figure 3 ).
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A New Grading System for Migrated Lumbar Disc Herniation on Sagittal Magnetic Resonance Imaging: An Agreement Study.
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