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Sesamoids

  • Named sesamoid bones because of resemblance to sesame seeds
  • Most constant sesamoids are those under 1st MTP joint, but can be present under other metatarsal heads
  • Develop by endochondral ossification
  • Ossification by age 8-12 yrs of age, females earlier
  • Multiple ossification centres which don't always fuse
  • Fibular sesamoid rarely partite
  • Tibial sesamoid bipartite in 10% of population, a quarter of whom have bilateral tibial bipartite sesamoids
  • Named sesamoid bones because of resemblance to sesame seeds
  • Most constant sesamoids are those under 1st MTP joint, but can be present under other metatarsal heads
  • Develop by endochondral ossification
  • Ossification by age 8-12 yrs of age, females earlier
  • Multiple ossification centres which don't always fuse
  • Fibular sesamoid rarely partite
  • Tibial sesamoid bipartite in 10% of population, a quarter of whom have bilateral tibial bipartite sesamoids

    • Central ridge, crista divides the under surface/trochlear surface of the 1st MTP joint, divides the two sesamoids
    • Medial and lateral metatarsaosesamoid ligaments and medial and lateral phalangosesamoid ligaments and intersesamoid ligaments are stabilisers
    • The sesamoids are embedded in the plantar plate in the plantar plate with attached to prox phalanx inferiorly by insertions of medial and lateral heads of flexor hallucis
    • The fibular sesamoid also attached to adductor hallucis, and intermetatarsal ligament
    • The tibial sesamoid is attached to abductor hallucis


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