A bone screw that is a low-profile, uniplanar bone screw is provided. The bone screw is for adjusting a position of a rod. The bone screw includes a main body, a rocker and a rod-securing element. The main body has a shaft with a threaded part. The rocker is coupled to and moveable relative to the main body. The rocker is configured to at least partially receive the rod. The rod-securing element is configured to secure the rod between the rocker and the rod-securing element and relative to the main body. The rod-securing element includes a fulcrum serving as an axis of rotation about which the rod rotates.