Pivot joint Pivot joint In animal anatomy, a pivot joint (trochoid joint, rotary joint, lateral ginglymus) is a type of synovial joint. In pivot joints, the axis of a convex articular surface is parallel with the longitudinal axis of the bone. According to one classification system, a pivot joint like the other synovial joint —the hinge joint has one degree of freedom. Note that the degrees of freedom of a joint is not the same as the same as joint's range of motion. Pivot joints allow for rotation, which can be external (for example when rotating an arm outward), or internal (as
English saddle items. Modern endurance saddle manufacturers have been innovative in methods to lighten weight and provide additional comfort for the horse, and several of these techniques have gone on to influence other saddle types. The panels are stuffed with different types of material, all designed to spread pressure evenly and disperse sweat. Most endurance saddles may have extended panels (called "fans" or "blazers"), which increase bearing area. Others may have "floating" panels, which are particularly useful since endurance riders often ride with their seat out of the saddle (releasing pressure from the back, but increasing the amount felt on the stirrup