  Fixating fractured pelvis fragments with the sacroiliac screw is a common
treatment for unstable pelvis fracture. Due to the complex shape of the pelvis,
sometimes a suitable straight screw fixation channel cannot be found using
traditional methods, which increases the difficulty of pelvic fracture
fixation. Therefore, there is an urgent need to find a new screw fixation
method to improve the feasibility of pelvic fracture fixation. In this study, a
new method of arc nail fixation is proposed to treat the pelvic fracture. An
algorithm is proposed to verify the feasibility of the internal arc fixation
channel (IAFC) in the pelvis, and the algorithm can calculate a relatively
optimal IAFC in the pelvis. Furthermore, we compared the advantages and
disadvantages of arc channel and straight channel through experiments. This
study verified the feasibility of the IAFC, and the comparison of experimental
results shows that the adaptability and safety of the arc channel fixation is
better than the traditional straight sacroiliac screw.
