With the first contact, the patients will receive oral and written information about the study. During this contact it is possible for the patient to have an extra person along. If requested by the patient/needed for decision-making concerning study participation, we will offer second project information to the patient with the option to bring an assessor. Patients can decide to participate in the study up to a week before surgery, where they will come to the information day prior to surgery, which is a part of the normal fast-track program. There is an average waiting period between first contact and surgery of 4 weeks, which means that patients have 3 weeks to decide. Written informed consent will be obtained before commencement of data collection, at the latest on the information day prior to surgery. When the consent form is signed DXA scanning and filling out questionnaires will commence, and post-operative stereoradiographs and DXA scans will be booked.