Of the 14 cases in which two screws were used bilaterally, five 35.7% had rod breakage, and of the remaining cases, four of the six 67% with more than four iliac screws had rod breakage.
Figura 2 De los 14 casos en los que se utilizaron dos tornillos bilateralmente en cinco 35,7% se produjeron roturas de barras, de los seis restantes con mas de cuatro tornillos iliacos en cuatro casos 67% se produjeron roturas de barras.