La. Metelman et al., A MECHANICAL EVALUATION OF THE RESISTANCE OF VARIOUS INTERFRAGMENTARYWIRE CONFIGURATIONS TO TORSION, Veterinary surgery, 25(3), 1996, pp. 213-220
Fourteen interfragmentary orthopedic wire configurations were tested i
n torsion using a transverse fracture polyvinylchloride pipe model. Th
ese models included single and double Kirschner pins with and without
orthopedic wire added to the configuration. The orthopedic wire was ap
plied in either an encircling, figure-of-eight (skewer pin), or crucia
te pattern. Double Kirschner pins were applied in a mono- or biplanar
fashion. An external fixator model was also tested. Stiffness, yield l
oad, safe load, and energy of absorption were measured and calculated
for each model. Orthopedic wire added to any configuration increased s
tiffness. All single pin configurations with orthopedic wire and the e
xternal fixator had the highest stiffness. Two Kirschner pins had a hi
gher torsional yield load and safe load than single pin configurations
with or without orthopedic wire. The external fixator model had the h
ighest torsional yield load, safe load and energy of absorption of all
configurations tested. However, the external fixator was only signifi
cantly different in safe load from the 90 degrees biplanar configurati
ons with wire and the cross pin configuration with encircling wire. Th
e 90 degrees biplanar configurations with wire and the cross pin confi
guration with encircling wire were equally as effective as the externa
l fixator model in yield load and energy of absorption. (C)Copyright 1
996 by The American College of Veterinary Surgeons