IMEX® Duraface® half-pins (U.S. Patent 8,282,676) demonstrate a 55% average increase in stiffness and a 3.7 fold increase in cyclic fatigue life compared to current positive-profile pins without an increase in cost. These mechanical improvements can prolong the integrity of the pin-bone interface in challenging orthopedic cases.
Increased stiffness, increased ultimate strength and prolonged cyclic fatigue life of these magnitudes were previously thought only possible with positive-profile pins of increased diameter. Unfortunately, pin diameter is often the limiting factor in pin selection when stronger pins are necessary. Before describing this new pin technology in detail, let me describe clinical scenarios where improved pins would be most valuable.