Development of a novel orthopedic microfastener

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Title: Development of a novel orthopedic microfastener
Author: Agnihotri, Mukul Mukund
Abstract: Over the last decade , biodegradable screws and plates have received wide acceptance over metallic fasteners for orthopedic fracture fixation . A biodegradable fastener would gradually "disappear" during healing of a fractured bone or tissues , therefore avoiding a secondary operation to remove that fastener . When using a metal fastener , the current approach requires manual threading on a large bone fragment for fixation . This technique is difficult when it is required to fixate a small bone fragment . This study puts forth the development of a threadless , polymer based orthopedic fastener for small fragment fixation which would provide stability and interfragmental compression to the fracture site . The fastener was designed with ratchets on its surface , which deflect during insertion into the drilled hole in the bone and subsequently stiffen to hold the bone fragments in place due to interference . The head of the fastener was developed analogous to a Belleville washer which deflects during insertion of the fastener and subjects the bone fragments to interfragmental compression . Finite element analysis (FEA ) was conducted to design the fastener profile and assess its performance . The push -in and pull -out forces predicted by FEA were comparable to the experimental results for the prototype of the microfasteners . The push -in force was found to increase with increasing insertion depth and radial interference . The force required to initiate pull -out was maximum and was reduced with reducing fastener bone contact . An analytical model was proposed to explain the fastener bone interaction . It was found to be in good agreement with the FEA and experimental results at low levels of interference .
URI: http : / /hdl .handle .net /1969 .1 /4791
Date: 2007-04-25

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Development of a novel orthopedic microfastener. Available electronically from http : / /hdl .handle .net /1969 .1 /4791 .

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