What is the anatomy of the metatarsal bones relevant to transmetatarsal amputation (TMA)?

Updated: Apr 29, 2021
  • Author: Palaniappan Lakshmanan, MBBS, MS, AFRCS, FRCS(Tr&Orth); Chief Editor: Erik D Schraga, MD  more...
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Answer

The metatarsal bones are numbered 1 through 5, from medial to lateral. Each metatarsal has a head, neck, shaft, and base. The metatarsal bones are roughly cylindrical in form. The body tapers gradually from the proximal to distal end. They are curved in the long axis and present a concave plantar surface and a convex dorsal surface.

The base at the proximal end is wedge-shaped, articulating proximally with the tarsal bones and by its sides with the contiguous metatarsal bones; its dorsal and plantar surfaces are rough for the attachment of ligaments.

The head at the distal end presents a convex articular surface, oblong from above downward, and extending farther backward plantar than dorsal. Its sides are flattened, and on each is a depression, surmounted by a tubercle, for ligamentous attachment. Its plantar surface is grooved anteroposteriorly and marked on either side by an articular eminence continuous with the terminal articular surface.

For more information about the relevant anatomy, see Foot Bone Anatomy.


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