In principle, internal fixation should be removed to prevent rejection of the graft, to prevent breakage of the internal fixation, and to avoid delaying CT or MRI examinations of the relevant area due to internal fixation. However, in some cases, the internal fixation may not be removed, if the internal fixation is made of absorbable material, it is not necessary to remove the internal fixation. In addition, if the elderly are older and relatively inactive, the internal fixation may not be removed after surgery. If there are some special parts after the surgery, such as the collar plate after the ligament reconstruction, it is not necessary to take it out at this time, it will not have much effect in the body. Therefore, most of the internal fixations need to be taken out, but in rare cases they can be left out.