Optimizing the individual design of revision hip implants – evaluating the effects for bone and stem using patient-specific finite element models
DS 133: Proceedings of the 35th Symposium Design for X (DFX2024)
Year: 2024
Editor: Dieter Krause; Kristin Paetzold-Byhain; Sandro Wartzack
Author: David Scherb; Maria Helena Barbosa; Harald Volkl; Christopher Fleischmann; Marcel Betsch; Stefan Sesselmann; Sandro Wartzack; Jorg Miehling
Series: DfX
Institution: Engineering Design, Friedrich-Alexander-Universitat Erlangen-Nurnberg (FAU), Germany; Institut fur Medizintechnik, Technical University of Applied Sciences Amberg-Weiden, Germany; Department of Trauma and Orthopedic Surgery, University Hospital Erlangen, Friedrich-Alexander-Universitat Erlangen-Nurnberg (FAU), Erlangen, Germany; Technical University of Applied Sciences Wurzburg-Schweinfurt, Germany
Page(s): 015-024
DOI number: 10.35199/dfx2024.02
Abstract
Patient-specific musculoskeletal models (MSM) can improve the selection and positioning of revision total hip arthroplasty (THA) during preoperative planning. By accounting for muscle weakening due to surgical procedures, MSMs provide more accurate load data for finite element models in preclinical testing. This paper presents a preclinical study using finite element analysis (FEA) to investigate the effects of changes in hip parameters – femoral neck angle, antetorsion and femoral offset – on implant longevity after revision. 57 proximal femur CAD models, based on MRI scans of a patient, were used to create femoral implants with unique parameter combinations. FEA simulations of stair climbing, which accounted for reaction forces of the hip joint, showed that all parameter changes affected the stress distributions, with the increase in antetorsion having the strongest effects on bone-implant interface stresses.
Keywords: Patient-specific musculoskeletal models, Revision total hip arthroplasty, Cement-in-cement technique, Finite element models, Parameter study