By Mohammed Rafiq Abdul Kadir (auth.)
This booklet offers analyses of the main as a rule mentioned failure modes of hip stems: loosening and thigh soreness; either are attributed to the relative movement and instability on the bone-implant interface as a result of failure to accomplish adequate basic fixation. The booklet investigates different factors which can impact basic balance and hence the long term end result of hip arthroplasty. the implications supplement experimental paintings performed during this zone as in-vitro experiments have numerous barriers that may be addressed via laptop simulations.
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Additional info for Computational Biomechanics of the Hip Joint
For the AML, the collar was removed, the stem was shortened to the average length of the Alloclassic and the ABG, and the distinction between the porous-coated and the smooth section was ignored. The prosthesis was regarded as having a homogeneous surface structure throughout the stem. This also applied to the ABG, where the different surface finish between the proximal and distal part was ignored. The indentation features in the proximal part of the ABG were removed. The surgical technique of the ABG requires that the distal part is over-reamed to avoid cortical contact in this area.
3. Corin Medical, Gloucestershire, UK. 4. DePuy, Warsaw, IN. 5. Smith and Nephew, Memphis, TN. 6. Stryker Howmedica Osteonics, Rutherford, NJ. 7. S and G Implants, Lübeck, Germany. 8. Wright Medical Technology, Arlington, TN. 9. Zimmer, Warsaw, IN. From this search, three groups based on the overall geometry of the stem were chosen similar to the one proposed by other authors mentioned above—the tapered design, the anatomic and the straight cylindrical. Hip stems which were not tapered in any plane in the distal half were grouped together.
The earlier generation of cementless stems were too stiff compared to the bone—about 10 times too stiff. A stiff material will make load transfer inefficient, and eventually cause ‘stress-shielding’—an adverse bone remodelling phenomenon where bone is resorbed in areas where it is not loaded to physiological levels. This stiffness mismatch between the stem and the bone causes loss of proximal cancellous bone and thickening of distal cortical bone. It was, and still is, one of the major problems in hip arthroplasties, both cemented and cementless.