Customized patient-specific instrumentation for use in orthopaedic surgical procedures

A customized patient-specific orthopaedic instrument, comprising:

• a customized patient-specific cutting block having a body that comprises (i) a bone-facing surface having a customized patient-specific negative contour configured to receive a portion of a bone of a patient that has a corresponding contour, (ii) an outer surface opposite the bone-facing surface, (iii) a first cutting guide corresponding to a predetermined customized patient-specific cutting plane, the first cutting guide including a slot, and (iv) a second cutting guide that is parallel to the first cutting guide and spaced apart from the first cutting guide by a predetermined distance, the second cutting guide including a slot, and
• a breakaway tab covering the second cutting guide and removably coupled to the second cutting guide by a perforated sheet,
• wherein the customized patient-specific negative contour of the bone-facing surface includes a unique plurality of depressions and ridges that match a corresponding plurality of ridges and depressions of the corresponding contour of the portion of the bone of the patient.