A hinge provides swiveling of a display relative to one side of a host body including a first fastening seat, a pintle, a second fastening seat, a main torsion anchor member, a torsion rotary member, an ancillary torsion anchor member, a compressed elastic reed assembly and a nut. The receiving apparatus receives the data cells and stores them in the buffer memory. The load is distributed to a second layer and the load is transferred in the normal direction to the first density of subchondral bone. The shield is further provided with apertures to permit passage of air supplied by an air supply duct. The bag can be collapsed by moving the rigid insert away from the second sidewalls and bottom to allow the second sidewalls to fold either inward or outward.