1. A method for surgical planning, comprising: displaying a set of related two-dimensional (2D) anatomical images; identifying a plurality of anatomical landmarks on the set of 2D anatomical images; scaling a three-dimensional (3D) representation of a parent prosthesis to match a scale of the set of related 2D anatomical images based at least in part on a relationship between the plurality of anatomical landmarks; displaying a 2D representation of the scaled 3D parent prosthesis on at least one of the set of related 2D anatomical images; scaling a three dimensional (3D) representation of at least one child prosthesis to match the 3D scaling of the parent prosthesis; relating the at least one scaled 3D representation of the child prosthesis to the scaled 3D parent prosthesis based on a known relationship between the parent prosthesis and the at least one child prosthesis; and taking a 2D representation of the 3D relationship between the at least one child prosthesis and the parent prosthesis which is consistent with at least one of the images from the set of related 2D anatomical images.