Commonly , patients with chronic pain face psychological problems that directly affects their self-esteem and social interaction . Thus , we have the Short Form Health Survey ( SF -36 ) widely used in assessing the quality of life of patients with low back pain ( MILANI et al . , 2009; VERESCIAGINA ; AMBROZAITIS ; AKAUSKAS , 2009; AHRENS ; SCHILTENWOLF ; WANG , 2010; Luedtke et al . , 2011; HAUGEN et al . , 2011) . It is a non-specific questionnaire consisting of 36 items divided into social function , mental health index , physical and social function , pain index , vitality , physical appearance and emotional and general health perceptions , which concludes the evaluation protocols volunteers in this study ( Rosanova et al . , 2010) .