«La inmovilización con placas mejora la resistencia torsional en la estabilización del tercio proximal de las fracturas de húmero.»
David M. Weinstein MD, Derek R. Bratton BS, William J. Ciccone II MD and John J. Elias PhD,
Medical Education and Research Institute of Colorado, Colorado Springs, CO, USA
This study quantified the torsional resistance provided by locking plates and angled blade plates used to stabilize proximal humeral fractures. Three-part proximal humeral fractures were created in 6 pairs of cadaveric humeri. One specimen of each pair was reconstructed with a proximal humeral locking plate, whereas the other specimen was reconstructed with an angled blade plate. An external rotation torque, varying from 0 to 5 N-m, was applied to the humeral head until the head rotated 30° or 10,000 loading cycles were applied. The mean initial torsional stiffness was significantly larger for the locking plates (0.99 N-m/degree) than for the blade plates (0.59 N-m/degree). For each pair, the maximum rotation was larger for the blade plate than for the locking plate. For this in vitro model of a reconstructed 3-part proximal humeral fracture, the locking plate provided better torsional fatigue resistance and stiffness than the blade plate.
Journal of Shoulder and Elbow Surgery. Volume 15, Issue 2 , March-April 2006, Pages 239-243.