Video narration
As you prepare to take a step, your weight shifts, your leg begins to move, and the prosthetic lower leg follows the body's motion. But the movement does not start in the device. Before the foot leaves the ground, the brain forms a movement command: an instruction to begin the step. That command travels through the nervous system, down toward the lower limb, coordinating the body's next action. This is the key shift in perspective. The prosthetic leg is not deciding to walk on its own. It responds as part of the person's movement, using the body's motion and its own engineered components to support the step in sequence. So what looks mechanical is still human-directed. A single step begins with intention in the brain, moves through the body, and ends as coordinated movement with the prosthetic lower leg.