I was asked to do a part assembly for a hip prosthesis as a project. I found few projects here on GRABCAD to start with. The problem I'm having is the appropriate constrains. I just started using computers applications to make models so you could say I'm a beginner. The project is a four part assembly which are stem, femoral head, liner(can be ignored) , accepetal shell. This can be done in CATIA or Cad as I can convert one to the other. 2D and 3D sketches are required.
attached is a picture of the required parts.