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The maximal BMI that possibly be treated with commonly used 3.5-inch (88.9 mm) needle
| L4 15° TFEI | L5 15° TFEI | L4 20° TFEI | L5 20° TFEI | L4 25° TFEI | L5 25° TFEI | |
|---|---|---|---|---|---|---|
| BMI | 36.41 | 36.89 | 34.92 | 34.97 | 32.97 | 32.93 |
TFEI: transforaminal epidural injection, BMI: body mass index.
