the motion permitted at a joint ranges from no movement , such as where some skull bones interlock at a suture, to extensive movement like that seen at the shoulder, where the humer articulates with the scapula. the structure of each joint determines both its mobility and its stability. there is a(n) direct relationship between mobility and stability in articulations. when the mobility of a joint increases, its stability decreases . in contrast, if a joint is immobile, it has maximum stability.