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Feasibility of Using a Tactile Tracking Technique for 3D Measurement of Patella Movements

Mahzoun Alzakerin, Hadis | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48563 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Farahmand, Farzam; Narimani, Roya
  7. Abstract:
  8. Even though Patellofemoral pain syndrome is one of the most frequent pains and disabilities in knee area, the pathology of this illness has not achieved the needed accuracy and clearness. Most researchers believe the cause of this pain syndrome and disability of it, is abnormal activities of patella. Nevertheless, no non-invasive method has been presented to measure three-dimensional movements of patella in patients. It seems evolving a method based on tactile tracking which surface and touchable trait of knee bone is used can benefit to measure three-dimensional movements of patella non-invasively. On the basis of this, the main idea of the project is registering the pressure changes in anterior surface of patellar during its movement by pressure sensitive sensors which are located in a knee brace in order to calculate the movement path by considering the patellar geometry. During the project, firstly feasibility study of pressure data collecting from anterior surface of a patellar model by using a piezoelectric pressure sensor has been done. Afterwards, by using finite element modeling and simplification of patella touch to spherical surfaces, a method to transform pressure data to geometric data has been presented. In the following necessary algorithms for non-rigid registration and synthesis of geometrical mentioned data with the geometry of the anterior surface of the patella have been developed to achieve the 3-dimensional movements of it. Three-dimensional kinematics analysis and determining displacement and rotational movement components have been done in two methods, using the transformation matrix and Euler-Kardan computing. Finally, accuracy and efficiency of suggested method has been evaluated by comparing to motional data of patellar movement and by comparing results with acceptable error, the above method has become successful to measure patella 3-D movements. By considering available methods to measure three-dimensional movements of patella in dynamic and non-invasive way, suggested method in this project is a completely new and innovative method which can omit the available methods’ accuracy and efficiency limitations
  9. Keywords:
  10. Finite Element Analysis ; Iterative Closest Points ; Patellofemoral Joint ; Patellotracking ; Registration Algorithm

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