Cognitive functional therapy (CFT) compared with core training exercise (CTE) in patients with failed back surgery syndrome (FBSS): A study protocol for a randomized controlled trial

OBJECTIVE: This study aims to investigate the efficacy of cognitive functional therapy (CFT) compared to core training exercise (CTE) on pain and specific disability of patients with failed back surgery syndrome (FBSS). DESIGN: This will be a randomized controlled clinical trial of two groups with blinded evaluators.