IRCT20190311043012N1 IRCT 2019-06-18 Semnan University of Medical Sciences assessment the thickness of multifidus muscles activity before and after one session dry needling in patient with low back pain Ultrasonographic evaluation thickness of Multifidus muscles before and immediately after dry needling in non- specific low back pain patients in comparison sham group 2019-04-22 anticipated 20 Complete https://irct.ir/trial/38202 interventional Randomization: Not randomized, Blinding: Double blinded, Placebo: Not used, Assignment: Parallel, Purpose: Treatment, Blinding description: Participants are blind to the type of intervention, that way in sham group, the needle is moved only on the skin and the needle does not actually enter the multifidus.the main investigator is blind to the type of intervention of each participant, so that main investigator uses the assistant to intervene. N/A Non-specific chronic low back pain. Intervention 1: Intervention group: First intervention group: non-specific low back pain volunteers, with real dry needle therapy. In this one session technique, needles with sizes 0.30 ~ 50 mm or 0.30 ~ 60 mm are used according to the size of the muscle participant. In this technique, the patient is lying down and inserted the sterile needle into the muscle of the multifidus at the L4-L5 or L5-S1 levels. needle is placed approximately 1.5 cm next to spinous proces vertically at the desired surface. After punching the surface of the skin, the needle toward the multifidus and lumbar vertebral lamina.oriented downward and inward (approximately 20 °). Intervention 2: Control group: nonspecific low back pain volunteers without insertion of needle(sham).In this technique, like intervention group, the patient is prone and the needle contacts the skin without insert to the muscle. No - There is not a plan to make this available Justification or reason for not sharing IPD is No more information