电磁导航系统辅助后交叉韧带重建胫骨隧道定位的效果评价

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Abstract Objective To evaluate the effect of the electromagnetic navigation system in assisting the posterior cruciate ligament reconstruction of the tibial tunnel positioning，and to provide a better surgical method for the clinic.Methods 30 fresh frozen adult knee joint specimens of the lower limbs were selected，regardless of gender，age，and left and right sides.The CT data of the specimens were imported into the electromagnetic navigation system for three-dimensional modeling.The optimal surgical path planning was completed before the operation，and the electromagnetic navigation system was real-time during the operation.The reconstruction of the tibial tunnel was completed under monitoring，and the sagittal angle，tunnel length and exit position of the tibial tunnel were measured.Results Among 30 cases of knee joints，28 cases of steel needle exit point were located in the preoperatively planned footprint area，which was an effective tibial tunnel.The effective rate of electromagnetic navigation assisted tibial tunnel positioning was 93.33%.The excellent and good rate was 85.71% (24/28).The preoperative planning sagittal angle is (59.72±2.32)°，the postoperative measurement is (59.55±2.35)°，the error is (0.16±1.9)°；the preoperative planning tibial tunnel length is (69.56±2.79)mm，and the postoperative The actual measurement is (70.34±2.38)mm，and the error is (－0.78±2.27)mm.There was no significant difference in the sagittal angle and length of the tibial virtual tunnel planned before operation and the actual measurement after operation (P＞0.05).Conclusion The electromagnetic navigation system assists in the positioning of the tibial tunnel in the downward reconstruction of the posterior cruciate ligament，with high accuracy and convenient operation，which can be used as a good auxiliary positioning method.

Key words： electromagnetic navigation technology posterior cruciate ligament reconstruction tibial tunnel arthroscopy sagittal angle

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[1]	. [J]. sygkzz, 2021, 27(4): 359-362.