Effectiveness of Dry Needling in Patients With Chronic Nonspecific Low Back Pain

Inclusion Criteria: * Patients age between 18 to 45 years. * Moderate pain at rest (between 30 and 60 in NPRS). * Patients with trigger points in the lumbar multifidus muscle. * Patients have the ability to speak and read Persian. Exclusion Criteria: * Currently taking anticoagulant medications * Specific low back pain (Neurogenic low back pain, Spinal stenosis, cauda equina syndrome, spondylolisthesis, and Presence of any signs or symptoms of non-musculoskeletal pathology e.g. cancer, infection and fracture in low back and lower extremities based on paraclinical findings) * Prior surgery to the lumbosacral spine * Inability to obtain prone lying * Severe malalignments in the cervical, thoracic, lumbar or pelvic region and the lower limbs * History of uncorrected vision impairment, vestibular, hearing or cognitive impairments * Leg length discrepancy which disturbs balance * Systemic diseases, such as diabetes, fibromyalgia, rheumatoid arthritis, degenerative diseases and other rheumatoid diseases * Needle phobia * Sacroiliac pain as identified with six clinical tests: compression, distraction, sacral thrust, thigh thrust, Gaenslen's and FABER's