Could this have cause damage to sciatic nerve?

While zip-lining on Maui in July, I took a pretty hard "butt landing." Didn’t notice anything-no subsequent pain. However, every day for the past month I have pain in my left buttock that often travels down the leg. Could damage to any of the sciatic nerves show up 3 or 4 months later? I am [...] http://bit.ly/pG5fA0