Flexion-Relaxation Ratio Asymmetry And Its Relation With Trunk Lateral Rom In Individuals With And Without Chronic Non-Specific Low Back Pain

Imbalance in trunk muscle activation between right and left sides can induce pain by loading the spine incorrectly, especially in NSCLBP patients. A previous study reported a greater asymmetry in the flexion-relaxation phenomenon of the erector spinae in NSCLBP patients than in asymptomatic participants (AP). Imbalance of muscle properties, such as trunk ROM, has been suggested as a possible cause of this observed asymmetry.