A method of and a system for sharp object detection using computed tomography images are provided. In one embodiment, the implanting assembly includes a gastrostomy feeding tube, an inner sheath and an outer sheath. The auxiliary pair of load bearing surfaces are located on the tibial component, posterior to the central cam, centered between the tibial condyles, and on the femoral component, posterior to the femoral central camming surface, centered between the femoral condyles. The reversible pump is operated in a first direction to supply ink from the ink reservoir to the ink jet cartridge via the first fluid line.