Anatomical study of the sesamoid bones of the first metatarsal.

The authors undertake an anatomical study of the sesamoid apparatus to determine its mechanical functions. The intersesamoid ligament is of particular interest, since its functions are diverse and complex. The sesamoid apparatus appears to coordinate the various forces that converge upon the forefoot into the great toe. The apparatus then seems to form part of a catapult that assists propulsion.