The Reliability of Rehabilitative Ultrasound Imaging of the Cross-sectional Area of the Lumbar Multifidus Muscles in the PNF Pattern. [Purpose] The primary purpose of this study was to evaluate the intraclass correlation coefficient (ICC) in obtaining the cross-sectional area of the lumbar multifidus muscles in patients with chronic low back pain (LBP) at rest and during contractions facilitated by PNF patterns by ultrasound imaging.  [Conclusion] Our results show that measurement with ultrasound imaging can be used in the treatment of LBP as an objective assessment.
ultrasound imaging
The cross-sectional area of the multifidus muscle was measured twice using ultrasonography.  [Results] The intraclass correlation coefficient of the cross-sectional area of the multifidus muscle measured by ultrasonography was excellent. 
ultrasonography