3D non-linear analysis of the acetabular construct following impaction grafting |
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| Authors: | A T M Phillips P Pankaj C R Howie A S Usmani A H R W Simpson |
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| Institution: | 1. Edinburgh Orthopaedic Engineering Centre, The University of Edinburgh , Room FU.413, Chancellor's Building, 49 Little France Crescent, Edinburgh, EH16 4SB, Scotland, UK;2. School of Engineering and Electronics, The University of Edinburgh , Edinburgh, Scotland, UK;3. School of Engineering and Electronics, The University of Edinburgh , Edinburgh, Scotland, UK;4. Edinburgh Royal Infirmary and Department of Orthopaedics , The University of Edinburgh , Edinburgh, Scotland, UK;5. Edinburgh Royal Infirmary and Department of Orthopaedics , The University of Edinburgh , Edinburgh, Scotland, UK |
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| Abstract: | The study investigates the short-term behaviour of the acetabular construct following revision hip arthroplasty, carried out using the Slooff–Ling impaction grafting technique; using 3D finite element analyses. An elasto-plastic material model is used to describe the constitutive behaviour of morsellised cortico-cancellous bone (MCB) graft, since it has been shown that MCB undergoes significant plastic deformation under normal physiological loads. Based on previous experimental studies carried out by the authors and others, MCB is modelled using non-linear elasticity and Drucker Prager Cap (DPC) plasticity. Loading associated with walking, sitting down, and standing up is applied to the acetabular cup through a femoral head using smooth sliding surfaces. The analyses yield distinctive patterns of migration and rotation due to different activities. These are found to be similar to those observed in the clinical setting. |
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| Keywords: | Finite element Plasticity Hip arthroplasty Impaction grafting |
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