A prosthesis for an amputated lower leg consisting of an upper part attachable to the remaining lower leg stump, this upper part being attached to an under part provided with an artificial foot. The upper part has a cup-shaped bottom portion which at a number of places along its circumference merges...http://www.google.co.uk/patents/US4128903?utm_source=gb-gplus-sharePatent US4128903 - Temporary walking aid for use after lower leg amputations
