Design of a modular orthopedic implant

Erkan, Onur Mert
Bone fracture due to trauma and bone defects by birth are very common in orthopedics, making their treatment crucial. In this study, a novel design to treat upper arm fractures is introduced and assessed mechanically. The design offers medical doctors longitudinal and angular flexibility when compared to widely used orthopedic plates. Hence the new design covers a variety of fracture types. Earlier conceptual designs are reviewed to demonstrate the progress of design. Mechanical performance of the final design is evaluated using analytic methods, finite element analysis and physical experiments. Assessment was based on a safe axial external load of 15 kgf suggested by the medical doctors and focused on the rigidity problems caused by modularity, along with strength concerns. It is proven in this study that the novel design can fix the fracture successfully, even under the aforementioned external load.


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Fixation of bone fractures over a desired time period is one of the most important requirement for their healing processes. Fracture fixation devices are designed to satisfy particular requirements for different types of bone fractures. Conventional and locking plates, intramedullary rods and screws of trauma surgery, and polyaxial screws, connectors and rods of spinal surgery are the examples of contemporary implants for varying bones and their fractures. The mentioned fixation system is inspired from spin...
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Many cases of bone defects require bone grafts addition into the body. Bone tissue substitutes have more advantages over other bone grafts because of low infection risk and abundance of materials. Local delivery of drugs or bioactive agents can help in these diseases’ treatments and bone growth overall while avoiding side effects or drug interference. To accelerate local bone regrowth, a research about developing a controlled local release system of bioactive agents to bone cells was conducted in this study...
Citation Formats
O. M. Erkan, “Design of a modular orthopedic implant,” M.S. - Master of Science, Middle East Technical University, 2015.