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Anatomy and pathology of the sesamoid bones

The hand compared to the foot

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Summary

The sesamoid bones were studied in 100 hands and feet in 50 cadavers and in 1000 radiographs of the hands of South Sinai Bedouin children. The sesamoids of the metacarpophalangeal joint of the thumb and metatarsophalangeal joints of the hallux were always present in the dissections and radiographs. Other sesamoids were observed in the radiographs of the metacarpophalangeal joints of the index finger in 50% of the cases, the middle finger in 3%, the ring finger in 1% and the little finger in 70%. Sesamoids were also seen in 62% of the interphalangeal joints of the thumb. There are differences between the hand and the foot in relation to the occurrence of degenerative changes in the joints. In the thumb, the metacarpophalangeal joint is involved macroscopically in 75% of the cases, and only in 13% of the radiographs, with the pathological changes located in one or the other part of the joint. In the hallux, 40% of the cases are involved both macroscopically and in radiographs, but all the parts of the joint are affected.

Résumé

Pour étudier les os sésamoïdes (OS), 100 mains et 50 pieds ont été disséqués sur le cadavre et les radiographies des mains de 1000 enfants bédouins du sud Sinaï ont été examinées.

Les os des articulations métacarpo-phalangienne du pouce et métatarso-phalangienne du gros orteil, ont toujours été retrouvés, aussi bien dans les dissections que sur les radiographies. Les autres OS observés dans l'articulation MP se répartissent ainsi: index: 50% des cas; médius: 3%; annulaire: 1%; petit doigt: 70%. Ils ont été mis en évidence dans 62% des cas au niveau de l'articulations interphalangienne du pouce.

Il y a des différences entre la main et le pied dans la fréquence des changements dégénératifs de ces articulations. Au niveau du pouce l'articulation n'a été trouvée affectée que dans 75% des cas à l'examen macroscopique et dans 13% seulement à l'examen radiographique. Les modifications pathologiques atteignaient l'une des deux extrémités articulaires. Pour le gros orteil, 40% des cas pathologiques ont été décelés tant à l'examen macroscopique que radiologique, mais dans cette localisation tous les composants de l'articulation étaient affectés.

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Goldberg, I., Nathan, H. Anatomy and pathology of the sesamoid bones. International Orthopaedics 11, 141–147 (1987). https://doi.org/10.1007/BF00266700

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