Two small bones in tendon of flexor hallucis brevis that articulate with plantar aspect of head of first metatarsal.


Blood supply to sesamoids comes from [1]:

  • proximal branch of first metatarsal artery
  • plantar branch of first metatarsal artery
  • via distal capsular attachment


Up to 20% of sesamoid bones are bipartite. Medial is bipartite 7x more than lateral.


Sesamoid is found in up to 40% under the hallux interphalangeal joint.


[1] Sobel M, Hashimoto J, Arnoczky SP et al: The microvascular of the sesamoid complex – its clinical significance. Foot & Ankle 13:359-363 1992

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