The interphalangeal articulations of hand are hinge-joints of the phalanges of the hand. There are two sets (except in the thumb): 'proximal interphalangeal joints' (PIP), those between the first (also called proximal) and second (intermediate) phalanges 'distal interphalangeal joints' (DIP), those between the second and third (distal) phalanges A similar group of articulations also function in the toes. [ http://en.wikipedia.org/wiki/Interphalangeal_articulations_of_the_hand ]