An orthopaedic instrumentation having an intermediate piece that has an opening for receiving an intramedullary reference. The intermediate piece such as a tibial template or a cutting guide is located on the resected tibia or femur in a manner that it optimally covers the resected surface of the tibia or the femur. A bushing guide is provided for mounting on the intermediate piece. The bushing guide has a circular opening. An offset bushing is rotatably mounted in the opening in the bushing guide. A trigger flange is slidably mounted on the offset bushing. The trigger flange can slide back and forth relative to the offset bushing. An indicia is formed on the upper surface of trigger flange. The indicia when aligned with one of the indicia on the offset bushing body measures the offset of center of a bore in the trigger flange from center of the offset bushing. The offset bushing can rotate around its longitudinal axis in the opening in the bushing guide. Indicia on the offset bushing may be used to measure the orientation of the center of the hole in the trigger with respect to the center of bushing body.