First, if think you might file a lawsuit, file it NOW! The statute of limitations, or time within which to file a lawsuit in your state, is only 2 years for personal injury, so if the accident occurred "almost 2 years ago," you may be almost out of time.Second, in terms of whether it's worth filing a lawsuit: a property owner is not liable simply because you were injured on his or her property. Rather, to be liable, he or she must have been at fault in some way, such as through negligence, or unreasonable carelessness. "Black ice" is difficult to see or detect; the property owner would likely not be liable if--1) no one had reported it to him or her, and he or she (or his or her employees) did not themselves walk over that patch prior to your fall, so that they would have known (or reasonable should have known) of the hazard--i.e. with knowledge of the condition, there's no obligation to do anything; or2) the ice was in a place that people don't normally walk, so even if they knew of it, the property owner would not be expected to treat it; or3) even if the property owner was aware of the ice and it was somewhere that should be treated (e.g. on a walkway), there was no time to do anything about it (e.g. the storm was still happening).