Dave's PCF WIP: Paragraphs

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In certain embodiments, a navigation guide 900 may include a registration key 938. The registration key 938 serves to further guide a surgeon to position the navigation guide 900 in a desired location with respect to anatomy of a patient. In certain embodiments, the registration key 938 may include one or more structures of the inferior side 918 that extend down into, or on, one or more of the adjacent joints and/or between the bones. The registration key 938 facilitates a desired alignment and placement of a navigation guide 900 on one or more joints and/or between bones. In one embodiment, the registration key 938 includes a protrusion that engages an opening between two bones of a joint. The registration key 938 may be on an inferior side 918 of the body 906. The registration key 938 can be formed by a variety of structures, including recesses, planar parts of an inferior side 918, angled parts of an inferior side 918, one or more projections added to an inferior side 918, openings in guide features, and the like.

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