The main principle of fixation of the patellar claw is that the upper and lower claws are fastened at the same time, and there are threads between the two claws, which can be tightened with a needle holder or a professional tool, and after the threads are tightened, there is a groove in the middle for screwing, and two screws can be screwed. If you want to remove the patella, cut open the epidermis of the patella, cut open the patellar claw, remove the two screws on the upper side of the patella with a professional screwdriver, and then remove the patellar claw. In addition, during the removal process, it may be necessary to separate the claw opening of the upper three claws of the patellar claw and the claw opening of the lower two claws with an electric knife, because the soft tissue will also affect the removal of the patellar claw.