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(A) Foraminal area of all lumbar intervertebral levels from L1–2 to L5–S1 in neutral and 30°hyperextension supine position. (B) Foraminal height of all lumbar intervertebral levels from L1–2 to L5–S1 in neutral and 30° hyperextension supine position. (C) Foraminal width of all lumbar intervertebral levels from L1–2 to L5–S1 in neutral and 30° hyperextension supine position. **Significant differences were found between two positions (P < 0.01).
