Customized patient-specific instruments configured to be selectively attached at predetermined locations of a patient's bone are disclosed. The customized patient-specific instruments may include a polymeric body including a bone-facing surface having a customized patient-specific negative contour shaped to match and receive a corresponding positive contour of the patient's bone at the predetermined location. The customized patient-specific instruments also include a metallic coating that defines one or more cutting slots. A method of performing an orthopaedic surgical procedure is also disclosed.