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Pinching 15 N repetitively with five voluntary closing prostheses fatigue free is impossible for 26%–100% of prosthesis users. Fatigue-free operation is considered at 20% of users’ maximum cable force5 and is desired for ADL. Cable forces required to pinch 15 N with five voluntary closing prostheses vary between 33 and 131 N.2 The maximum strength of 13% of prosthesis users is insufficient to pinch 15 N with the Hosmer Soft Hand.
