By Mohammed Rafiq Abdul Kadir (auth.)
This publication provides analyses of the main generally said failure modes of hip stems: loosening and thigh discomfort; either are attributed to the relative movement and instability on the bone-implant interface because of failure to accomplish adequate basic fixation. The publication investigates different factors that can impact basic balance and consequently the long term end result of hip arthroplasty. the consequences supplement experimental paintings performed during this region as in-vitro experiments have a number of boundaries that may be addressed via desktop simulations.
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Extra info for Computational Biomechanics of the Hip Joint
The adjusted models will therefore be referred to as the ‘cylindrical’ (group 1), the ‘tapered’ (group 2) and the ‘anatomical’ (group 3) designs respectively. The models were loaded in accordance with both Fisher’s gait analysis and Duda’s stair-climbing loads and the results were then compared between each other. From the first set of results, bone elements with a surface area of more than 50 µm of interface micromotion were adjusted so that contact between these elements and the implant was no longer available.
The other type of hip stem used in a later study (Chap. 3) was the ABG (Stryker Howmedica Osteonics, Rutherford, NJ), and the 3D solid models of this stem were obtained in IGES format—a geometric data file format than can be imported by CAD software. Creating a surface mesh from this type of file format could be done using the automatic meshing routine in MARC but this option was uncontrollable; it created an uneven mesh density. stl file format. 6). 6 The ABG hip stem in the original IGES format surface meshed in MARC (left) and the completed model after repairing the surface boundaries in MAGICS (right) surfaces were meshed individually in MARC with a certain triangular grid size and MAGICS was used to repair manually the elements across the surface boundaries.
The code had a nonlinear interface condition where the connection between the elements in the interface was eliminated when tensile stress perpendicular to the interface occurred. A new FE calculation was then performed, thus allowing changes in the stress distributions. This process was repeated several times until only small changes in the stresses were found. The FE model used in this comparative study consisted of 14,940 eight-noded hexahedral elements and 16,638 nodes. All other parameters (geometry, material properties, boundary conditions) were the same as Rohlmann’s.