[Observations on optimizing the mechanical properties of osteosynthesis screws].
According to two agreeing standards, the mechanical requirements for bone screws consist of a minimum breaking torque and of the minimum angle of rotation to failure of 180 degrees. Apparently it has been overlooked that these requirements admit austenitic steels with a very low yield strength, which reach the required torque at fracture only by the work-hardening brought about during the torsion test. As a high yield strength is a prerequisite of a stable fixation, a formulation is proposed which guarantees not only a high elastic torque but also an adequate work of deformation in the plastic state as an insurance against embrittlement.
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Institut für Chemie, Montanuniversität Leoben, Osterreich.
D001696:Biomechanical Phenomena; D001860:Bone Plates; D001863:Bone Screws / Q000592:standards*; D005593:Fracture Fixation, Internal / Q000295:instrumentation*; D006801:Humans
Betrachtungen zur Optimierung der mechanischen Eigenschaften osteosynthetischer Schrauben.