
I bought a long handled grabber thing from Pets at Home, one where the two sides of the grabber look a bit like a wide toothed rake. I hadn't hurt my back though, I was just lazy. It works well, the only problem is that the combs on the grabber bit get a bit gunky... but I imagine you have that problem with a shovel too. The grabber is much better at picking up the more Mr. Whippy like poos than a shovel.
Hope your back starts to feel better soon!
Clare