A comprehensive, integrated study of the clavicle: Its topographical anatomy, biomechanical architecture and function; pathological anatomy of mid-shaft fractures and the decision-making process for a surgical approach when planning an intramedullary impl
Part 8 Ideal approaches to the insertion of an intramedullary implant for fixation of diaphyseal fractures
DOI:
https://doi.org/10.24297/ijct.v26i.9864Keywords:
Clavicle, Mid-diaphyseal fractures, Intramedullary fixation, Antegrade approach, Retrograde approach, Supraclavicular nerves, BiomechanicsAbstract
Highlights: The shape and form of the clavicle is neither S, z nor like the f-musical key, but rather resembles a swan’s neck. Therefore, fractures in its 3/5th and 4/5th sections lend well to an intramedullary implant. The primary function of an intramedullary device is to reduce and realign displaced fragments and hold them in place until there is sufficient stabilizing woven callus.
Stability depends on the length, diameter and interference fit of an intramedullary implant bridging the fracture. The antegrade approach to insert an IM implant is suitable for fractures in the 5/10th and 6/10th sections, and the retrograde approach for the 6/10th and 7/10th sections from the sternal end of the clavicle. There is less than 30 degrees of clavicle rotation under 90 degrees of arm elevation, which is less than 45 degrees of the screw turn or quarter of its pitch, so it can scarcely cause a significant loosening of a threaded implant.
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