By Mohammed Rafiq Abdul Kadir (auth.)
This ebook provides analyses of the main in general pronounced failure modes of hip stems: loosening and thigh soreness; either are attributed to the relative movement and instability on the bone-implant interface because of failure to accomplish enough fundamental fixation. The publication investigates different factors which can impact fundamental balance and for this reason the long term end result of hip arthroplasty. the consequences supplement experimental paintings conducted during this zone as in-vitro experiments have numerous obstacles that may be addressed via computing device simulations.
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This booklet provides analyses of the main in general stated 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 fundamental fixation. The e-book investigates different factors which can have an effect on basic balance and as a result the long term final result of hip arthroplasty.
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Additional info for Computational Biomechanics of the Hip Joint
The CLS is also a proximal fixation design, and as such a suitable size was decided based on the stem that appropriately filled the proximal part of the femur. The aligned and appropriately sized stems were presented to and judged by an experienced orthopaedic surgeon to confirm that the reconstruction followed the design concept and implantation of the individual hip stem. 7. 4 Construction of Bone-Implant Contact Once the stem was appropriately in place, the osteotomy level was set to about 10 mm above the upper end of the lesser trochanter.
These nodes are available in all models at exactly the same location, thus allowing proper and exact comparison. 14. There was a significant difference between the coarsest (Tet-A) and the rest of the refined models. However, once refinement was made, there was little difference between all four refined models. The tetrahedral model seemed to converge after two refinements (Tet-C) with a maximum variation of 8 %. This was roughly about 10,000 nodes and 40,500 tetrahedral elements. Ideally, one would do a convergence study for each analysis performed.
Rohlmann’s published result is displayed on the right. 20 shows the graph of relative motion along the cylindrical stem, where the distribution of micromotion along the stem was similar to Rohlmann’s. Peaks were found at both ends at the lateral and medial side, with maximum micromotion at the distal-medial point C. The rest of the surface had relatively small micromotion. 389 μm. 19 Results of the Rohlmann’s model using the micromotion algorithm (left) and the published result by Rohlmann et al.