Embodiments of the present invention allow unlimited rotational alignmentbetween two boundaries for alignment with anatomic landmarks while still referencingboth posterior condyles for A/P sizing of the distal femur. In particular embodiments,the system provides at least one movable paddle that provides a reference pointfrom the condyles so that the measuring assembly can be aligned to be parallelwith the epicondylar axis. Once the measuring assembly is properly angled, theA/P length of the bone can then be measured from a proper reference point.