Grasp system (hardware and mobile application) during first 6 postsurgical weeks of rehabilitation. Subjects are instructed to report pain through squeezing the hardware in 3 different levels regulaly during the day, and, in addition enter answers to questions on patient reported outcome meassures (sleep quality, overall well-being, use of medication, appetit, physical activity) and register exercise time into the mobile application. Data entries will be presented as trajectories in graphs and charts in the app. At their 6 weeks physiotherapist consult, the physiotherapists will use the data during the consult.

Grasp system (hardware and mobile application) during first 6 postsurgical weeks of rehabilitation. Subjects are instructed to report pain through squeezing the hardware in 3 different levels regulaly during the day, and, in addition enter answers to questions on patient reported outcome meassures (sleep quality, overall well-being, use of medication, appetit, physical activity) and register exercise time into the mobile application.

Feasibility of the intervention study will be evalutated through adhererance to intervention protocol. It will be assessed as number of patients who are able to do as instructed in the protocol. Fidilty >80% will be considered high, 50-80% moderate, and <50% low. The investigators expect a priori the adherance to protocol guidelines to decline during the 6 weeks intervention period

Mixed methods approach will be used to evaluate user experience. The investigators will make a mixed methods synthsis between participants questionnaires (by 2 and 6 weeks of intervention) and semi-structured interviews of up to 10 participants and associated physiotherapists by the end of the intervention period.