Arrayhey hello Duke, I'm also doing something about a femur implant with Ansys' lattice optimization. And I've also read the article written by Altair in 2018 whose picture was cited in your comment. I think I may answer your question. The model in the picture can't be made directly by Altair's hyperworks. The idea of that article is using topology optimization to get a random geometry shape of where to optimize and where to keep. Then they may use other tools( I don't know what they use) to design the latter model what they called lattice optimization model to analyze in hyperworks as you see in the article. This is my view of this article. So I think the design idea of Ansys and Altair is different. The former's lattice optimization is automatically based on density that you got in your upstream result, but the latter doesn't have this function.n