Magnetic Resonance Elastography to Monitor Response to Manual Therapy in Myofascial Pain

Patient Inclusion Criteria: 1. Adult males or females (age ≥ 18 years) 2. A history of chronic low back for at least 3 months. (Measured by patient history and physical exam) 3. A palpable taut band or nodule within the skeletal muscle 4. Hypersensitive tender spot within the taut band 5. Recognition of current pain complaint by pressure on the tender nodule/taut band 6. Painful limit to the full stretch range of motion Patient Exclusion Criteria: 1. Pregnancy or breastfeeding 2. Any contraindication to an MRI exam, or severe claustrophobia that would prevent safe completion of the scan 3. Previous therapy in the area to be treated within 3 months 4. Previous severe back injury (including fracture) or surgery 5. Any neurological conditions or active systemic disease (e.g. diabetes, peripheral vascular disease, cancer, rheumatoid arthritis) that impaired sensation/pain perception 6. Severe osteoarthritis 7. Skin injuries in the area to be treated 8. Known or suspected clinically significant lumbar disc or other structural spinal pathology considered to be the primary cause of the participant's symptoms or makes study participation or manual therapy inappropriate. 9. Have a known history of any condition or factor judged by the investigators to preclude participation in the study or which might hinder adherence 10. Inability to provide consent.