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EI = Epidural injection.
| Study | Average Surgical Rate After EI | Average Non-Surgical Rate After EI |
| Kawu (2012) [19] | 7.05% | 92.95% |
| Baral (2011) [20] | 13.00% | 87.00% |
| Yang (2006) [30] | 15.80% | 84.20% |
| Kennedy (2014) [1] | 16.75% | 83.25% |
| Schaufele (2006) [29] | 17.50% | 82.50% |
| Sayegh (2009) [25] | 17.50% | 82.50% |
| Laiq (2009) [24] | 20.00% | 80.00% |
| Helvoirt (2014) [16] | 21.70% | 78.30% |
| Manson (2013) [18] | 44.00% | 56.00% |
