1. Apparatus for determining orientation of a limb within a medical image, the method comprising: a) an image receiver, configured to receive the image comprising said limb; and b) an orientation determiner, associated with said image receiver and configured to automatically determine an orientation of the limb based on analysis of internal image information, said orientation determiner comprising an edge detector to carry out edge detection to find lines in said image, said orientation determiner further configured to carry out a linear Hough transform on said lines to find at least one strongest line and to determine an inclination of said line, said inclination providing said orientation of said limb.