Comparative study of 3D printed navigation template-assisted atlantoaxial pedicle screws versus free-hand screws for typ
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ORIGINAL ARTICLE
Comparative study of 3D printed navigation template‑assisted atlantoaxial pedicle screws versus free‑hand screws for type II odontoid fractures Yang Li1 · Jing Lin2,3 · Yuan Wang4 · Haotian Luo1 · Jing Wang1 · Sheng Lu1 · Yongqing Xu1 Received: 20 March 2020 / Revised: 27 September 2020 / Accepted: 13 October 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Objective The objective of the study was to compare the safety, efficacy, and accuracy of the pedicle screws with the threedimensional (3D) printed navigation template to the free-hand screws for type II odontoid fractures. Patients and methods A total of 60 patients with type II odontoid fractures, treated with either template guiding pedicle screws or free-hand screws, were retrospectively assessed. The guiding group was treated with pedicle screws with the assistance of a virtual reality (VR) software-designed, 3D printed navigation template with two guide tubes. The safety rate and treatment efficacy of the screw placement, as well as the trajectory accuracy, were evaluated by respective measures and compared between two surgical groups. Results There were reduced surgical time (P
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