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FIG. 9C illustrates one example of a patient-specific bone engagement feature 912. The patient-specific bone engagement feature 912 is configured to engage at least a portion of one or more bones of a patient during a surgical procedure. The patient-specific bone engagement feature 912 engages the one or more bones and/or joints in a manner that positions the resection guide 820b in a predetermined position. Advantageously, the patient-specific bone engagement feature 912 includes features, structures, and/or aspects that can provide feedback to a user moving the resection guide 820b in relation to surfaces of one or more bones of the patient. These features, structures, and/or aspects of the patient-specific bone engagement feature 912 may cause the resection guide 820b to shift and tilt as a user moves the resection guide 820b to an approximate position on the bones. However, since the features, structures, and/or aspects are mirror images of the recesses, bumps, projections, and/or surface features of the one or more bones, the resection guide 820b will not sit stable and secure until the resection guide 820b locks/seats into place once the resection guide 820b is moved to the same (or substantially the same) position on, or relative to, the one or more bones as in a predetermined position. The patient-specific bone engagement feature 912 causes the resection guide 820b to lock and/or snap into place once the correct position that matches the predetermined position is located.

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