Biomechanical evaluation of the percutaneous pinning of unstable extra-articular fractures of the distal radius (A biomechanical study on an embalmed cadaver of the forearm)
Extraarticular displaced distal radius fractures were created on the forearms of the 28 embalmed cadevers. Four kinds of configurations of stabilizations were performed by using 4,3,2, and 1 Kirschner wires.Stabilization tests were done by using the 600 kN Universal Testing Machine of the Servo-Hydraulic type named Dartec.A force was applied and displacement at the fracture sides measured.Results were evaluated statistically.The samples which were stabilized by one Kirschner wire were detected to be unstable.The ones which were stabilized by two crossed Kirschner wires were consistently stable.When three and four Kirschner wires were used it was noticed that more rigid stabilization was achieved;But the results were not significantly different from the samples which 2 Kirschner wires were used. In conclusion,when minimum of 2 Kirschner wires were used for the fixation of the displaced extraarticular distal fractures of the radius,an adequate and safe stabilizaton could be achieved.
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