title: Comparative Analysis of the Biomechanical Behaviour of Two Cementless Short Stems for Hip Replacement: Linea Anatomic and Minihip.
abstract: A comparative study between two stems (Linea Anatomic and Minihip) has been performed in order to analyse the differences in their biomechanical behaviour, concerning stem micromotions and load transmission between stem and bone. From the corresponding finite element models, a parametric study was carried out to quantify ranges of micromotions taking into account: friction coefficient in the stem-bone interface, press-fit and two types of gait cycle. Micromotions were evaluated for each stem at six different levels along repeated gait cycles. An initial and marked stem subsidence at the beginning of the simulation was observed, followed by an asymptotic decrease due to friction forces. Once migration occurs, a repeated reversible cyclic micromotion is developed and stabilized as gait cycle times are simulated. The general motion pattern exhibited higher amplitude of micromotion for Minihip compared to Linea stem. The load transmission mechanism was analyzed, identifying the main internal forces. The results show higher local forces for Minihip stem up to 80% greater than for Linea stem. The differences of design between Minihip and Linea conditioned different distributions of load, influencing the posterior stress-shielding. Consequently, short stems require high bone stock and quality should, being indicated for young patients with high bone quality.
authors.affiliation: Department of Mechanical Engineering, University of Zaragoza, Zaragoza, Spain.|Aragón Institute for Engineering Research, Zaragoza, Spain.
authors.forename: Sergio
authors.initials: S
authors.lastname: Gabarre
authors.affiliation: Department of Surgery, University of Zaragoza, Zaragoza, Spain.|Aragón Health Sciences Institute, Zaragoza, Spain.
authors.forename: Antonio
authors.initials: A
authors.lastname: Herrera
authors.affiliation: Department of Mechanical Engineering, University of Zaragoza, Zaragoza, Spain.|Aragón Institute for Engineering Research, Zaragoza, Spain.
authors.forename: Elena
authors.initials: E
authors.lastname: Ibarz
authors.affiliation: Department of Surgery, University of Zaragoza, Zaragoza, Spain.|Aragón Health Sciences Institute, Zaragoza, Spain.|Department of Orthopaedic Surgery and Traumatology, Miguel Servet University Hospital, Zaragoza, Spain.
authors.forename: Jesús
authors.initials: J
authors.lastname: Mateo
authors.affiliation: Department of Surgery, University of Zaragoza, Zaragoza, Spain.|Aragón Health Sciences Institute, Zaragoza, Spain.|Department of Orthopaedic Surgery and Traumatology, Miguel Servet University Hospital, Zaragoza, Spain.
authors.forename: Jorge
authors.initials: J
authors.lastname: Gil-Albarova
authors.affiliation: Department of Mechanical Engineering, University of Zaragoza, Zaragoza, Spain.|Aragón Institute for Engineering Research, Zaragoza, Spain.
authors.forename: Luis
authors.initials: L
authors.lastname: Gracia
mesh_terms: D000069343:Bone-Implant Interface; D017276:Friction; D005684:Gait; D006622:Hip Prosthesis; D006801:Humans; D008954:Models, Biological; D013314:Stress, Mechanical; D016474:Weight-Bearing