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Figure 12.4. An external knee prosthesis for trans-femoral amputees. The damping of the knee joint is modulated to control the movement of the prosthesis throughout each walking cycle. (a) The prosthesis shown on the left comprises MR brake (1), potentiometerangle sensor (2), force sensors (3), and battery and electronic board (4). (b) The right plots show the maximum flexion angle during the swing phase versus walking speed. The patient-adaptive knee affords a greater symmetry between affected and unaffected sides.

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