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sesamoid bones; sesamoids small bones, developed as a centre of ossification within a tendon at the point of maximal force, e.g. overlying a joint or bony prominence; articular aspect of sesamoid is covered with cartilage; sesamoids are prone to the same range of bone pathologies as any skeletal element
bipartite sesamoid two-part sesamoid (i.e. pair of sesamoids, where expectation is for one), e.g. in up to 30% of flexor hallucis brevis (FHB) medial sesamoids
constant sesamoids sesamoids occurring in majority of population, to reinforce the host tendon, e.g. patella; paired sesamoids embedded within tendons of FHB at plantar aspect of first metatarsophalangeal joint (1 MTPJ); FHB sesamoids also give sagittal-plane stability to 1 MTPJ (forming a groove on plantar aspect of first metatarsal head within which flexor hallucis longus tendon) runs); also contribute to 1 MTPJ joint dorsiplantar depth, increasing 1 MTPJ efficiency at toe off
inconstant sesamoids; variable sesamoids sesamoids occurring in a minority of the population, e.g. sesamoids in slips of the tendon of flexor digitorum brevis at MTPJs; os perineum (sesamoid reinforcing peroneus longus tendon at plantar/lateral border of cuboid)
quadripartite sesamoid four-section sesamoid
tripartite sesamoid three-section sesamoid