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Stress Analysis of LCP and DCP in Normal and Osteoporosis Femur

Esmaeilpour, Mohammad Rasoul | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43526 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Firoozbakhsh, Keikhosrow
  7. Abstract:

  8. Metallic implants are often used in the open reduction and internal fixation of fractures. Open reduction and internal fixation are commonly used in cases of trauma when the bone cannot be healed using external methods such as casting. The locking compression plate combines the conventional screw holes, which use non-locking screws, with locking screw holes, which use locking head screws. This allows for more versatility in the application of the plate.
    In the present work, the stress (von-mises) and deformation of a locking compression plate fixed across a transverse fracture (2-mm gap) at the midshaft of femur was evaluated by Ansys software. Femur model is divided to two part (cortical and cancellous) to achieve a precise result. Mechanical properties for both normal and osteoporosis bone were applied to campare the results. Static loading tests performed in which the bone model was fixed distally. Samples were subjected to compression load and torque to detemine the stress (von-mises) and deformation of plate, screws, and femur. Comparable results were achieved in both the DCP and LCP constructs in which the plate was applied at or less than 1 mm from the bone. Also, different factors (number of screws, screw placement, length of plate, distance from bone, and plate thickness) which affect the stress(von-mises) and deformation of a locking compression plate (LCP) evaluated by Ansys software
  9. Keywords:
  10. Femur ; Stress Analysis ; ANSYS Software ; Internal Fixators ; Locking Compression Plate (LCP) ; Dynamic Compression Plate (DCP)

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