Wretenberg, Per, and Anders Ekelund. “Acute Hemiarthroplasty After Proximal Humerus Fracture in Old Patients: A Retrospective Evaluation of 18 Patients Followed for 2-7 Years”. Acta Orthopaedica 68, no. 2 (January 1, 1997): 121–123. Accessed May 15, 2026. https://actaorthop.org/actao/article/view/20736.