Inclusion Criteria:  dislocated hip fracture. planned cemented hemiarthroplasty. able to walk, with or without walking aids, prior to the injury.  Exclusion Criteria:  young and healthy patients with displaced hip fractures who are recommended total hip arthroplasty or open reduction / internal fixation of the fracture. patients with severe comorbidity and high risk of cement-related complications who are recommended uncemented hemiarthroplasty (some, but not all, patients with ASA (American Society of Anesthesiologists) grade 4). not able to give informed consent.