From the earliest days of anatomic knowledge the longitudinal arching of the foot has been looked on as designed to provide resilience and has been compared in its shape and function to a spring. This view is expounded in the classic textbooks of anatomy, and has been retained by more contemporary writers, as the term "spring ligament" implies.
The twenty-seventh English edition of Gray's "Anatomy" states:
The chief characteristic of this [medial longitudinal] arch is its resilience, due to its height and to the number of joints between its component parts.... It should be observed that in a normal foot the arches become flattened when erect posture is assumed and are restored when the weight of the body is taken off the feet. This resilience accounts for the suppleness of the normal foot and enhances the value of the arches by rendering possible such rapid and sudden movements as running
LAPIDUS PW. MISCONCEPTION ABOUT THE "SPRINGINESS" OF THE LONGITUDINAL ARCH OF THE FOOTMECHANICS OF THE ARCH OF THE FOOT. Arch Surg. 1943;46(3):410-421. doi:10.1001/archsurg.1943.01220090105009