[Pathology of the sesamoid bones of the hand].

Sesamoid bones are osseous parts of certain joints and can either be included in pathological changes of these joints or separately in those of the sesamoidal joint itself. The clinical relevance of such findings is described in the following examples: Rheumatoid variants, psoriasis, different types of hyperostotic forms, chronic sesamoiditis as well as post-trauma. In three out of four cases of fracture, the ulnar sesamoid bone of the metacarpophalangeal joint of the thumb was affected.