Effects of pin biomechanics, coating material and surface roughness on the pin-bone interface in external repair

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Some fractures require external fixation, anchored with metal pins in the bone fragments. The reatment is generally successful, although the pin tracts often loosen and become infected. This complication may jeopardise fracture healing and must be treated. The purpose of this project is to determine what aspects of pin design predispose to these problems at the pin-bone interface. Is it the way the pins are initially inserted, perhaps not tightly enough so that the pin is unstable, or perhaps too tight, causing microcracks in the bone? Is it the material of the pin, which might be improved with a bioactive coating? Is it the surface roughness which causes different responses of bone cells? Would it help to have an antibiotic pin? This proposal is designed to answer these questions. The biomechanics of the pin will first be studied with computer models and then tested in the laboratory. The loosening and infection associated with different types of pin will then be studied biologically. The results of the study will clarify the roles of pin biomechanics, coating and surface roughness, leading to improvements in design and better outcomes in fracture patients.