Cobalt Chrome Screws (CoCr) Test Report Summary

Background: Plating systems such as those for the wrist and elbow currently use 2.7 mm and 3.5 mm hexalobe locking and nonlocking titanium alloy (Ti) screws for fixation. To address patient considerations and market demand, CoCr screws were developed. Material properties and manufacturing process improvements led to the hypothesis that CoCr screws could demonstrate lower insertion and removal torque, and higher torsional yield than that of Ti screws. This technical bulletin provides a summary of the mechanical testing performed on both 2.7 mm and 3.5 mm locking and nonlocking CoCr Hexalobe Screws and their Ti counterparts.