Abstract: A trial prosthesis and saw guide system for use in orthopedic surgery to implant an orthopedic calcar-replacing femoral hip prosthesis. A trial femoral hip stem includes a longitudinal axis, a proximal portion and a distal portion, and a neck portion for temporarily receiving a trial femoral head. The proximal portion includes an elongate saw guide slot substantially parallel to the longitudinal axis. A trial femoral hip flange is provided for temporary insertion within the saw guide slot. An elongate rotary reamer is provided for reaming a socket in the medullary canal to receive the hip prosthesis. An elongate driver adapter has means at a proximal end for connection to a powered rotary driver and has means at a distal end for connection to the elongate rotary reamer.