But really, a twin pole setup is much more versatile. Using twin poles gives you better rhythm when hiking, and provides much better balance when crossing streams or log bridges. Even for trails, I like using twin poles. And you don't need to spend much more than you would for a single pole. REI, for instance, sells its very adequate Summit Trekking Poles for $60 (www.rei.com). A step up, with lighter poles and more comfortable grips, would be the Komperdell Titanal Trekking Poles ($90; www.rei.com). And some people swear by shock-absorbing poles such as the Leki Ultralite Ti Air Ergo PA AS trekking poles ($150; www.rei.com). But, my gut is that inexpensive poles will work just fine.
Very sorry to hear about your cycling accident, by the way. Four years ago I peeled off the bike and likely would have come off a lot worse had it not been for my helmet.