The exact time of extraction of the exposed pin depends on the healing of the fracture and whether there is an infection of the pin tract or the site of fixation. The general extraction time is between 4 and 12 weeks, because if the time is too short, the fracture will not form a bone scab and the fracture will be easily displaced again. If the time is too long, some bacteria will enter the body along the steel pin due to its exposure, which will cause infection of the pin tract, and in serious cases, it may cause deep infection, so it is necessary to choose a time of 4-12 weeks. For the fixation of the finger bone kerf, generally choose about 4 weeks for extraction, especially for the steel pin with fixed interphalangeal joint, generally choose about 4 weeks, not too late, too long time is easy to cause the infection of the needle tract, and another is easy to cause the stiffness of the finger joint, affecting the mobility of the joint. For the fracture of the extremity, it is recommended to remove the steel pin around 8 weeks, because there is obvious bone scab formation at the fracture end around 8 weeks, and it is recommended to protect the fracture end for a period of time by plaster or brace after removing the steel pin, which can increase the stability of the fracture end and avoid re-fracture. For some steel pins left in the external tool holder, the fracture healing is delayed and the exposed kyphotic pins can be extended to 12 weeks for extraction.