A surgical instrument (100) is disclosed having an elongated body portion (126) having a proximal end and a distal end. The body portion is formed from a plastically deformable material such that the body portion can be bent between the proximal and distal ends from a first configuration to a second bent configuration and maintains the bent configuration. A flexible circuit sheet (232) having at least a pair of lead wires (236) disposed around the body portion. The pair of lead wires are configured to conform to the bent configuration of the body portion such that they do not break during bending of the body portion. A tracking device (84) adapted to cooperate with a navigation system (10) to track the distal end of the instrument (100) is coupled to the flexible circuit.