Functional assessment A study participant performs the Coffee Task using a myoelectric prosthetic hand controlled by implanted electrodes and with control of wrist rotation. (Courtesy: J. Neural. Eng.

A prototype 3D-printed myoelectric prosthetic hand developed in Japan successfully passed a test by an upper-arm amputee, performing a series of intricate finger motions with more than 90% accuracy.

What if your muscles could do more than just move your body? Imagine flexing your arm to scroll through a webpage or clenching your fist to control a robotic arm. It sounds like something out of a sci ...