doi:10.1016/j.artd.2020.11.022engGómez-Vallejo, J.Roces-García, J.Moreta, J.Donaire-Hoyas, D.Gayoso, Ó.Marqués-López, F.Albareda, J.Biomechanical Behavior of an Hydroxyapatite-Coated Traditional Hip Stem and a Short One of Similar Design: Comparative Study Using Finite Element AnalysisART-2021-123251Background: The objective is to compare, by the means of finite elements analysis, the biomechanical behavior of a conventional stem of proven performance with a short stem based on the same fixation principles. Methods: A 3D femur was modeled from CT scan data, and real bone density measures were incorporated into it. Load stresses were applied to that bone in 3 different scenarios: without prosthesis, with the conventional stem, and with the short stem. Different bone loading patterns were compared by Gruen''s zones both visually and statistically using Welch''s test. Results: The implantation of a stem generates a certain degree of stress shielding in the surrounding bone, but the pattern of the change is very similar in the compared stem models. Although there is statistical significance (P < 0.01) in the mean stress variation in most of the Gruen''s zones, the magnitude of the difference is always under 2 MPa (range: 0.01 – 1.74 MPa). Conclusions: The bone loading patterns of the traditional stem and the short stem are very similar. Although there is no evidence of a link between biomechanics and clinical outcomes, our results may suggest that theoretical advantages of short stems can be exploited without the fear of altering bone loading patterns.2021http://zaguan.unizar.es/record/9977310.1016/j.artd.2020.11.022http://zaguan.unizar.es/record/99773oai:zaguan.unizar.es:99773Arthroplasty Today 7 (2021), 167-176by-nc-ndhttps://creativecommons.org/licenses/by-nc-nd/4.0/deed.esinfo:eu-repo/semantics/openAccess