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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