To compare the efficacies of two different interventional techniques (Caudal epidural steroid injection and S1 transforaminal epidural steroid injection) for the treatment of unilateral S1 radiculopathy.

Epidural steroid injections are commonly performed for the treatment of radicular pain resulting from a disc herniation. There are 3 different methods to deliver steroids to epidural area which are caudal, interlaminar and transforaminal routes. Lower lumbar and sacral radiculopathies can be managed with caudal epidural steroid injection which is generally quite easier to perform in comparison to transforaminal injection. Transforaminal epidural injection provides injectate to reach anterior epidural area and is the most target specific technique among others. In the present study investigators aim is to compare the success rates of these two different procedures regarding unilateral S1 radiculopathy. The patients referring to the pain medicine outpatient clinic of a university hospital for unilateral radicular pain and diagnosed S1 radiculopathy were planned to be randomized into these two different intervention groups.

Inclusion Criteria:

• Unilateral radicular pain resulting from a paracentral L5-S1 disc herniation causing S1 nerve root compression.

Exclusion Criteria:

• History of previous surgery, pregnancy, neurological disorders, bleeding diathesis, contrast medium allergy, spinal disorders, rheumatologic diseases

Patient data, statistics and study protocol can be shared.

1 week

Patients and the investigator assessing the treatment results were blinded to the injection technique.