Sesamoid bones and cartilages: An enquiry into their function

Abstract

Sesamoid bones are so-called because of their fancied resemblance to grains of wheat. T h e dictionary definition, however, states that sesame is an East Indian herb with oily edible seeds. In a figurative sense, it is also defined as "the key to a mystery; a way out of a difficulty." I have wondered if this last statement points to the correct function of sesamoids. Are they indeed the way out of the difficulty of explaining how a certain action of a muscle differs from its usually accepted function? T h e structure of sesamoids is well known and need not be reiterated at this time. Several functions have been postulated for sesamoid bones and cartilages by many anatomists and not a few surgeons over the years. This would suggest that none are likely to be correct. What is quite certain from a close study of the literature about these small bodies is that there is no unanimity as to the reason for their existence and exact function. T h e following seven functions have been suggested from time to time.