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Aml Total Hip Replacement Analysis

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Analysis of AML Total Hip Replacement
BMEN 3311: Biomaterials
Professor: Wei Shen
Trevor Springer: sprin222@umn.edu
Kristen Williams: will3893@umn.edu
1
Background
Every year within the United States, over 332,000 people receive a hip replacement1. Hip replacements, arthroplasty, are a medical procedure where diseased parts of the hip joint are removed from the patients and replaced with an artificial hip. The main causes for needing a hip replacement is for the wearing down of the hip joint. This wear down can result from osteoarthritis, rheumatoid arthritis, avascular necrosis, injury, and bone tumors2. DePuy Synthes first introduced a total hip replacement in the 1970s, later introducing the AML Total Hip system in 1983. According to DePuy, …show more content…
In addition, there are additives in the form of fillers that are used in the polyethylene in order to enhance mechanical properties further. These additives include a maximum of 40mg/kg Titanium, 20mg/kg Aluminum, 5mg/kg Calcium and 30mg/kg Chlorine10. The ASTM requirement also prohibits the addition of stabilizers10. This form of polyethylene, Ultra-High Molecular Weight Polyethylene, also has higher mechanical properties than lower molecular weight polyethylenes. This is due to the fact that an increased molecular weight leads to larger tensile strength and yield …show more content…
The high wear resistance allows for the material to last for a long period of time which is beneficial because this material is being implanted into a patient. The high impact strength is beneficial because the acetabulum receives a lot of high impact stresses when a person is walking/running and performing other tasks. The surface properties of this material, such as the lack of visual imperfections, are beneficial because the imperfections would lead to decreased biocompatibility and decreased functionality. The chemical properties (high molecular weight, simple repeat unit, and additives) of this material allow for higher mechanical properties that are adequate for this material due to the ultimate tensile stress of the polyethylene being greater than that of the

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