(c).
| Overall pain | MSN group | Steroid injection group | P value |
|---|---|---|---|
| Baseline | 6.94 ± 1.77 | 7.33 ± 2.09 | 0.425 |
| 1-month follow-up | 1.61 ± 2.14 | 4.03 ± 2.37 | 0.000 |
| 6-month follow-up | 0.90 ± 1.72 | 6.32 ± 2.64 | 0.000 |
| 12-month follow-up | 1.07 ± 1.69 | 6.48 ± 2.70 | 0.000 |
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