There have been studies of comparative anatomy and there are some features which undeniably show that Lucy, or Australopithecus Afarensis, was not a biped with human feet despite this popular image of her in artwork. (the operative term being, "artwork").
Evolutionary propaganda portrays her with human feet. In this topic we shall only discuss the skeletal remains of Lucy, only the parts they did find and show the significance that those anatomical parts play in highlighting just how obvious it is that Afarensis didn't have bipedal locomotion.
In the below diagram from CMI, I have highlighted in red the foramen magnum, where the spinal column is attached (significantly). Most importantly in humans the centre of that hole, and the distance between extremities, differs from the chimp and Lucy (Afarensis) I have shown this with the blue arrows.
foramen magnum.jpg 131.39KB 0 downloads
Secondly, the curvature of the fingers and toes strongly correlate with the brachiation in the other apes;
To compound this, when we look at a comparison of the shoulder socket in Afarenis and humans, clearly we see that Lucy had the arboreal anatomy of a brachiator, not a biped.
Please see the following link to see the graph for the fingers/toesm and the picture of the shoulder socket, and a full debunking of the notion that Lucy was the near-human you see depicted in the false evolutionary propaganda videos and artwork.
Conclusion: The most significant parts of the anatomy show that Lucy was clearly an ape, with curved finger/toes, a foramen magnum identical in it's measurements/ratio, to that of a chimp, and a shoulder that indicated brachiation. It seems any other anatomies that may look somewhat "similar" to humans, seem to be inconsequential. That is to say, a somewhat more gracile pithecine may have a superficial "closeness" to humans in some trivial, visual way, a sharing of somewhat similar shapings of certain bones, that essentially it seems to me, mean nothing. Where are the consequential differences? The bones that count, clearly depict a clear picture of ape-hood.