Prosthetic legs have been supported by high-performance carbon-fiber springs, but current prosthetic arms are way behind in terms of technology. Conventional prosthetic arms offer little freedom of movement, where as advance prosthetic arms offer higher flexibility, dexterity and feedback. The Defense Advanced Research Projects Agency created two prototypes for prosthetic arms. The first one can be controlled naturally with sensory feedback that allow eight degrees of freedom. The second is more ambitious and allows for a range of motion similar to a real arm.
Reference: Wired
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