ABSTRACT
All joint movements are rotational and can be measured in degrees or radians [1 radian (rad) = 57.3°]. Understanding lever systems is essential to know how force is applied to the movements of the body. Levers in human anatomy are basically comprised of bones that rotate around a xed point called a fulcrum or axis. e fulcrum usually represents the joints of the bones by interconnection. A lever represents the perpendicular distance from the axis of rotation to the line of action of a force.
