[Objective]To introduce the surgical technique and preliminary clinical outcome of 3D printing assisted C1/2 pedicle screw fixation of type Ⅱ odontoid fracture.[Methods]A total of 14 patients diagnosed with type Ⅱ odontoid fracture were simulated operation on the customized 3D model and guide before real surgery to determine the size,insertion point and depth of internal fixators.In the real sur-gery,a posterior median incision was made,lamina and spinous process were exposed after unipolar or bipolar electrocautery.The 3D mod-el was matched with the corresponding real lamina,facet joints and spinous process,screw path was individually drilled along the guide with a fine drill bit.After no error was found,the pedicle screw was inserted and fixed with a titanium rod to finish the fixation.The implant was removed 3 months after the fracture healed firmly.[Results]All the 14 patients got operation performed smoothly without vertebral ar-tery injury,nerve injury or incision infection.Compared with those preoperatively,the VAS score[(7.3±0.8),(2.9±0.6),P＜0.001]and NDI score[(61.8±4.9),(32.1±3.0),P＜0.001]significantly reduced 6 months postoperatively.Fracture union was achieved in all patients between 9 and 12 months after surgery,and internal fixation was removed around 12 months after surgery.Compared with those before removing in-ternal fixation devices,cervical rotational range of motion(ROM)[(55.8±7.0)°,(85.1±11.9)°,P＜0.001]and NDI scores[(25.2±4.9),(10.3±2.7),P＜0.001]significantly improved 7 days after the implant removed.[Conclusion]3D printing assisted C1/2 pedicle screw fixation of typeⅡ odontoid fracture is an effective treatment method,which can significantly restore cervical motion after internal fixation removed.
type Ⅱ odontoid fractureC1/2 pedicle screw fixation3D printing
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