PURPOSE: To compare the compression strength and pull-apart resistance of 5 single-piece scaphoid bone compression screws (Acutrak, Asnis, Herbert, Herbert-Whipple, and Little Grafter), with those of 2 dual-component screws (Kompressor and TwinFix). METHODS: Two blocks of polyurethane foam were compressed with a screw while held in a tension test machine, with the force measured at full insertion of the screw. The 2 blocks were then pulled apart, and the maximum resistive force was measured. RESULTS: The dual-component screws (Kompressor and TwinFix) gave greater compression force than the single-component screws, with the Kompressor screw giving statistically significantly greater compression than the TwinFix. The pull-apart resistance forces did not show such clear differences. CONCLUSIONS: The Kompressor screw achieves the greatest compressive forces and has one of the highest pull-apart forces. CLINICAL RELEVANCE: When compression and pull-apart resistance are considered, the Kompressor screw has advantages over other methods of scaphoid fixation.
PURPOSE: To compare the compression strength and pull-apart resistance of 5 single-piece scaphoid bone compression screws (Acutrak, Asnis, Herbert, Herbert-Whipple, and Little Grafter), with those of 2 dual-component screws (Kompressor and TwinFix). METHODS: Two blocks of polyurethane foam were compressed with a screw while held in a tension test machine, with the force measured at full insertion of the screw. The 2 blocks were then pulled apart, and the maximum resistive force was measured. RESULTS: The dual-component screws (Kompressor and TwinFix) gave greater compression force than the single-component screws, with the Kompressor screw giving statistically significantly greater compression than the TwinFix. The pull-apart resistance forces did not show such clear differences. CONCLUSIONS: The Kompressor screw achieves the greatest compressive forces and has one of the highest pull-apart forces. CLINICAL RELEVANCE: When compression and pull-apart resistance are considered, the Kompressor screw has advantages over other methods of scaphoid fixation.
Authors: Adam Hart; Edward J Harvey; Louis-Philippe Lefebvre; Francois Barthelat; Reza Rabiei; Paul A Martineau Journal: J Hand Surg Am Date: 2013-06-25 Impact factor: 2.230
Authors: Jochen Erhart; Ewald Unger; Philip Schefzig; Peter Varga; Inga Trulson; Anna Gormasz; Alexander Trulson; Martin Reschl; Michael Hagmann; Vilmos Vecsei; Winfried Mayr Journal: PLoS One Date: 2016-06-03 Impact factor: 3.240