A knee joint, of what has been judged to be the same species as “Lucy” (Australopithecus afarensis) was indeed found at a different location from the fossilized skeletal remains of the specimen known as “Lucy”. However, biologists have never claimed that this other knee was part of Lucy herself, only that it is another A. afarensis fossil. All of the bones which have been pieced together to form the 40%-complete female A. afarensis skeleton dubbed “Lucy” were in fact found at the same location. This particular claim has been widely repeated by creationists; they are–I will say they are, ahem, “mistaken” in this claim. (At least some of them have admitted it was a mistake and retracted the claim.)
See Talk.Origins’ Lucy’s Knee Joint: A Case Study in Creationists’ Willingness to Admit their Errors for details.
Incidentally, the Forerunner site where this bogus tale has cropped up this time around is on the fringes of Christian fundamentalist extremism. See, for example, this interview, in which leading Christian Reconstructionist the Rev. Andrew Sandlin first insists “[Christian Reconstructionists] certainly do not want an Ayatollah fundamentalist regime…Our goal is not to harm any particular group or any minority”, then goes on to say that “the public worship of a false god is forbidden…the Bible does seem to forbid public worship that is contrary to Christian worship…We certainly cannot permit the public proselytizing of religions that are going to undermine our religious faith and also the state itself…in certain cases there will be some intolerance”. Sandlin blithely compares his proposed abolition of freedom of religion to the current banning of manger scenes in front of public buildings as examples of the inevitable “intolerance” of any legal system.
Personally, if the Forerunner said the sky was blue, I’d be sure to carry my umbrella. But that’s just me.