The Effect of the Presence of Active Trigger Points in the Muscles Innervated by the Affected Nerve Roots on the Treatment Results of Transforaminal Epidural Steroid Injection in Patients With Lumbar Radiculopathy.

The association between lumbosacral radiculopathy and the ipsilateral gluteal trigger point has been demonstrated in 74% of previous studies in patients with chronic low back pain. It has also been found to be associated with lumbosacral radiculopathy, central sensitization and myofascial pain in previous studies.

From these data, it can be hypothesized that the presence of a myofascial trigger point in the relevant muscle segment may alter the efficacy of the transforaminal epidural steroid injection (TFESI) procedure used in the treatment of lumbosacral radiculopathy. We could not find any study on this subject in the literature. Although the most accurate level for the TFESI procedure is determined according to the patient's examination and imaging findings, patients may not benefit from the procedure sufficiently due to the trigger points on the same side as the radicular pain before the procedure. Another hypothesis is that active trigger points will transform into latent or normal tissue after the TFESI procedure and patients will benefit significantly. This assumption will provide insight into the possible underlying mechanism in some patients who do not benefit from the TFESI procedure. If the active trigger points become latent or there is a significant change in the pressure pain threshold after the TFESI procedure, the formation mechanism of the trigger points will be understood.

TFESI is one of the procedures routinely applied to patients diagnosed with lumbosacral radiculopathy in investigator's clinic. Among the patients who are planned to undergo TFESI procedure, those who are suitable for our study will be selected. Data such as demographic characteristics, height, weight, which leg the pain is reflected in, additional diseases, medications, the stage of the disc herniation, pressure on which nerve root, presence and number of active trigger points, muscles will be recorded before the procedure. Numerical Rating Scale (NRS), Short Form-12, Central Sensitivity Inventory (CSI), Doulour Neuropathic 4 (DN4), 6-point Likert Scale, Jenkins Sleep Scale, Istanbul Low Back Pain Disability Index, Pressure Pain Threshold (active trigger points will be evaluated with an algometer) will be applied to the patients before the procedure. The patients will be evaluated for the presence of active trigger points before the procedure and the patients will be divided into 2 groups as those with active trigger points and those without. The same procedure will be applied to both groups as planned before inclusion of the patients in the study, in the same way as the patients ineligible for the study. Patients will be re-evaluated with the scales and methods mentioned above at the 3rd week, 3rd and 6th months after the first procedure. TFESI procedure will be performed again in the 3rd week and 3rd month for the patients whose NRS values decrease less than 50 percent after the previous procedure.