Abstract: The stabilizing prosthesis device comprises a functional skeletal structure having a rigid flat sole extending parallel to the ground surface, and at least one upright half-shell adapted to at least partially envelop the patients's limb and provided with means of anchoring the limb. Extending between the sole and the half-shell there being a connection part having a bottom portion defining a sloping upper surface whereby the patient's center of gravity can be shifted forward in alignment with the extension of the sole.