It's almost impossible to get rid of poison ivy by cutting it or digging it out, since the roots are very well established under the ground. It can look like you have it all out, but you almost never get it all, and it comes back with attitude.
Herbicides like Roundup, which is a glyphosate-based herbicide, and Ortho Brush-B-Gon, which is triclopyr-based, can be used to get rid of poison ivy. These products will kill a great variety of woody plants, but they will kill many other plants, too, so don't use them near specimens you wish to keep.
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It's almost impossible to get rid of poison ivy by cutting it or digging it out, since the roots are very well established under the ground. It can look like you have it all out, but you almost never get it all, and it comes back with attitude.