Ron's joints are the places where his bones connect. Some joints don't move, such as the joints in the skull. But others are movable. They come in two main kinds.
Hinge joints move in a more limited way.
They swing back and forth like a hinge on a gate. Hinge joints are found in Ron's elbows and knees, and between the bones in his fingers and toes. And joints play an important role in Ron's game. Also, joints come in handy when Ron wants to jump for a rebound, a block, or a slam-dunk. He's almost coiling up like a spring so that he can explode out of that position.