 This project will be of a prospective cohort design where all patients who are scheduled to undergo a total joint replacement total knee arthroplasty or total hip arthroplasty at Bornholms regional hospital will be invited to participate. Due to the minimal effort and time required filling out the questionnaires and performing the 30sec chair stand test a minimal number of patients are expected to decline participation. Based on clinical experience the annual number of patients to undergo lower extremity TJR at Bornholms regional hospital is expected to be around 160 patients. 