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A Subject-Specific Simulation of Tibial Osteotomy Surgery Using Finite Element Method

Hosseini, Hossein | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51277 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Farahmand, Farzam; Hoviat Talab, Maryam
  7. Abstract:
  8. Varus-Valgus deformity increases local stress in cartilage and the other soft tissues of knee. This phenomenon may adversely influence patient’s walking pattern and also lead to worsen its existing impairments. In this situation, osteotomy is used to modify the alignment of the lower limb. Using CT-scan, radiography data, and their experiences, surgeons quantify the amount of modification. However, in many cases, the surgery does not result in desired output. It seems that the effects of soft tissues, which play an important role in this respect, should be taken into account. In order to design effectively for the osteotomy surgery, it is necessary to develop a patient-specific musculoskeletal model; so it makes it possible to evaluate the results of any kind of osteotomy surgeries.The goal of this project is to develop a patient-specific musculoskeletal model from the knee joint of an individual with Varus, in order to simulate osteotomy surgery of tibia. This model includes influential biomechanical parameters which by considering them, it is possible to make the desired modification and forecast the consequences of the surgery. Firstly, the geometry of the knee was obtained through the CT-scan and MRI; then, this model was taken in ABAQUS after being modified in CATIA. In the created FE model, bones are considered solid, cartilage and meniscus are linear elastic material, and the ligaments are modeled by nonlinear parametric springs. To find the properties of ligaments, first by using Factorial method, the most effective variables were determined; then, optimized range of variation of these variables were calculated by evaluating the results in all possible conditions. Finally, optimized values of effective variables were obtained by using Design of Experiments (DOE) Method, so that simulation results coincide with real conditions of patient’s knee. With substitution of optimized parameters and finalizing the model, the surgery was simulated.The simulated results are in very good agreement with the experimental data. The findings of the present study assert the capability of the presented FE model in simulating and predicting the results of the osteotomy surgeries
  9. Keywords:
  10. Osteotomy Surgery ; Knee Modelling ; Finite Element Analysis ; Subject-Specific Model ; Varus-Valgus Deformity

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