With the new procedure designed by John Hopkins University, the amputees who use the artificial arm are able to control wrist, hand and elbow movements at the same time. The patients report that the use of the arm requires no more conscious effort than moving your natural arm. This is achieved by rewiring nerves in the body to the arm. The remaining nerves at the amputated location are first connected to the muscles at the chest. When the patient wants to move the arm, those muscles receive signals from the brain, and they then instruct the arm to move. This enables a smooth control of the robotic arm. The procedure still has some drawbacks such as the implementation time and cost, however it still is the most advanced technique of its type.

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Reference: nytimes.com

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