HIP REPLACEMENT: Answer 5 questions: (more or less 1 page in total) 1. What two methods would you use to calculate the wear of the device? Please explain the methods and how these methods measure the level of wear. 2. There are a number of different types of designs and materials choices for a hip prosthesis as well as fixation methods. The choice of each is dependent on the age and activity levels of the patient. Therefore, if a patient was relatively young and active (daily jogging) what type of design, material and fixation method would you use. Please explain your choices for each. 3. Imagine you have designed a new prosthesis for the hip, what criteria do you need to adhere to for it to be patentable, and please discuss what aspects of the design can be altered for your ‘new prosthesis’ to meet each of these criteria. 4. An aspect of hip prosthesis placement is to avoid ‘stress shielding’. Please define what ‘stress shielding’ is and what issues it can lead to for the implant. What implant designs or implant methods can be implemented to avoid this stress shielding? 5. Comment on how the geometry of the femoral neck and head of the device will affect the failure of the device over time. What could you do to improve the device’s lifespan based on its geometry and the effect of the geometry on the stress.
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