A Study Comparing Computerized Tomographic Progression of Bone Bridging After Subtalar Fusion Using Fully and Partially Threaded Screws

"The Acumed Acutrak 2® - 7.5 is a fully-threaded headless screw fixation, composed of 17 unique screw size options. The Acutrak 2® - 7.5 is available in sizes from 40 mm to 120 mm and is inserted using a 4.0 mm hex driver over a .094 guide wire. The Acutrak 2 Part Number is 30-0XXX and 30-0XXX-S."

The Synthes® 7.3 mm Cannulated screws are available in three thread options: 16 mm, 32 mm or fully threaded. This study will use the partially threaded options. The screws can be placed by small diameter guide wires. They are composed of 316L stainless steel or titanium alloy (Ti-6Al-7Nb).