“…Surgery can be an option to relieve pain in rheumatoid arthritis, osteoarthritis and back conditions (Boonen and Severens, 2011 ; Gore et al, 2012 ; Xie et al, 2016 ). A large number of psychological aspects related to pain, such as anxiety, depression, cognitions, expectations and personality traits can be considered as strong predictors of the outcomes of these interventions (Schade et al, 1999 ; Trief et al, 2000 ; DeBerard et al, 2003 ; Kohlboeck et al, 2004 ; den Boer et al, 2006 ; Abbott et al, 2011 ; Judge et al, 2012 ; Block et al, 2013 ; Akins et al, 2015 ; Anderson et al, 2015 ; Kunutsor et al, 2016 ; Alattas et al, 2017 ; Lindberg et al, 2017 ; Mancuso et al, 2017 ). Each of these factors seems to differently affect the various outcomes of the treatment, leading to a boost of the direct and indirect costs of the care.…”