1. A computer implemented method of obtaining data for determining a 3-dimensional implant shape to be implanted in a subject, the method comprising: (a) obtaining computer readable image data of a target tissue wherein the target tissue comprises two portions, a portion with a defect and a portion without a defect; (b) rendering from the image data a computer-generated 3-dimensional representation of the target tissue; (c) superimposing a template onto the 3-dimensional representation, wherein the template represents a normative shape of an anatomical surface of the target tissue; and (d) deforming the template to the computer-generated 3-dimensional representation to create a deformed template having a shape that is used to determine the 3-dimensional implant shape, wherein the 3-dimensional implant shape matches the shape of the deformed template.