The purpose of this study is to investigate the effectiveness of cognitive behavioral therapy delivered as an e-therapy program, combined with physical exercise delivered by physiotherapists, for patients on waiting list for total knee arthroplasty. The patients will be randomized to either 1) a non-surgical program consisting of web-based cognitive behavioral therapy combined with physiotherapy, 2) total knee arthroplasty (TKA) surgery followed by web-based cognitive behavioral therapy combined with physiotherapy, or 3) a control group who undergo TKA followed by standard physiotherapy.
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Change in the knee injury and osteoarthritis score (KOOS) pain subscale
Timeframe: Before randomization, 12 months after treatment start. Also measured at 3, 6, and 24 months after treatment start.12 months after treatment start will be the primary outcome.