Customized patient-specific contact segments for orthopaedic surgical instrument using bone silhouette curves

A customized patient-specific surgical instrument comprising a polymeric body including:

• a bone-facing surface and an outer surface positioned opposite the bone-facing surface;
• a first bone-contacting segment coupled to the bone-facing surface and having a bone-contacting surface that is raised relative to the bone-facing surface, wherein the bone-contacting surface defines a customized patient-specific first negative contour shaped to match and receive a corresponding first positive contour of the patient's bone, wherein the first positive contour corresponds to a silhouette curve of a three-dimensional model of the patient's bone, wherein the silhouette curve corresponds to a contour of the patient's bone visible in a first two-dimensional image of the patient's bone that is related to the three-dimensional model;
• and a surgical guide defined by inner walls that extend from the outer surface to the bone-facing surface or to the bone-contacting surface of the bone-contacting segment, wherein the polymeric body includes a base and an elongated first arm coupled to the base, and the first bone-contacting segment extends from the base to a posterior end of the first arm.