The term ‘Saddle Bone Deformity‘ is occasionally given for what is a dorsal metatarsal cuneiform exostosis. It is an enlargement of bone that develops on the top of the foot at the base of the first metatarsal bone and the medial cuneiform bone. The terminology is used in the lay literature and it is not referred to as a Saddle Bone deformity in the medical literature.
The dorsal midfoot area on very rare occasions is referred to as the saddle of the foot, hence the name ‘Saddle Bone deformity’.
This should not be confused with a ‘saddle joint’ with the concave-convex bone interaction in the joint. A saddle joint is a synovial joint where one of the bones in the joint is shaped like a saddle and the other bone resting on it like a rider that is on a horse. These types of joints provide good stability with movement. Examples of saddle joints are the carpometacarpal joint of the thumb and maybe the calcaneocuboid joint in the foot.
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Dorsal Metatarsal Cuneiform Exostosis
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