An elastically operating control unit (5), containing one or more integrated elastic elements (22,24) in the form of springs, is linked to the main foot-part (2) and to the lower leg adapter (4). The front link (13) of the control unit is linked to the front part of the main foot-part, while the rear link (29) is linked underneath and behind the link (10) of the lower leg adapter and main foot-part. The toe part (3) of the foot is in the form of an especially elastically flexible foot-plate joined to the main foot-part.
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