Do you have L3-4 foraminal symptoms as you noted that your pain was consistent with L5-S1 in a prior post? If you have foramina stenosis as a pain generator, McKenzie methods would not be as helpful as this treatment technique uses extension mobilization as a tool and extension can aggravate the nerve root in a narrowed foramen.
Make sure you aggravate your symptoms prior to the TFESI and keep a pain diary for three hours after to get a diagnosis.
Dr. Corenman