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Above-Elbow Bionic Arm Can Control Every Finger
(www.scientificamerican.com)
This is a most excellent place for technology news and articles.
That's pretty common. The abandonment rate for upper limb prostheses is fairly high. Upper limb prosthesis users tend to favor traditional cable systems over myoelectric devices due to the feeling of having more control of it and being the driving force of the prosthesis as opposed to activating a set of electrodes. Also, factor in the cost of the devices which is upwards of $100,000.