Figure 1. Comparison of the Proportion of Patients Achieving Effective Pain Relief in Parasagittal and Midline Epidural Injection.

The NRS < 3 at 4 weeks after PIL or TF epidural injection (left figure); Mean pain score (NRS) during follow-up time between two groups of PIL and TF epidural injection (right figure) and Abbreviations: NRS, numeric rating scale; PIL, parasagittal interlaminar; TF, transformainal.