title: A Novel Anterior Transpedicular Screw Artificial Vertebral Body System for Lower Cervical Spine Fixation: A Finite Element Study.
abstract: A finite element model was used to compare the biomechanical properties of a novel anterior transpedicular screw artificial vertebral body system (AVBS) with a conventional anterior screw plate system (ASPS) for fixation in the lower cervical spine. A model of the intact cervical spine (C3-C7) was established. AVBS or ASPS constructs were implanted between C4 and C6. The models were loaded in three-dimensional (3D) motion. The Von Mises stress distribution in the internal fixators was evaluated, as well as the range of motion (ROM) and facet joint force. The models were generated and analyzed by mimics, geomagic studio, and ansys software. The intact model of the lower cervical spine consisted of 286,382 elements. The model was validated against previously reported cadaveric experimental data. In the ASPS model, stress was concentrated at the connection between the screw and plate and the connection between the titanium mesh and adjacent vertebral body. In the AVBS model, stress was evenly distributed. Compared to the intact cervical spine model, the ROM of the whole specimen after fixation with both constructs is decreased by approximately 3 deg. ROM of adjacent segments is increased by approximately 5 deg. Facet joint force of the ASPS and AVBS models was higher than those of the intact cervical spine model, especially in extension and lateral bending. AVBS fixation represents a novel reconstruction approach for the lower cervical spine. AVBS provides better stability and lower risk for internal fixator failure compared with traditional ASPS fixation.
authors.affiliation: Department of Anatomy, Guangdong Provincial Medical Biomechanical Key Laboratory, Academy of Orthopedics of Guangdong Province, Southern Medical University, Guangzhou 510515, China;Wuhan Concrete Technology Company Limited, Gaoxin Avenue 818, Wuhan 430200, Hubei, China e-mail: wu315129181@163.com.
authors.forename: Weidong
authors.initials: W
authors.lastname: Wu
authors.affiliation: Department of Orthopedics, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325000, Zhejiang, China e-mail: chenchunkk@163.com.
authors.forename: Chun
authors.initials: C
authors.lastname: Chen
authors.affiliation: Department of Orthopedics, Wuzhou Red Cross Hospital, Wuzhou 543002, Guangxi, China e-mail: njp008@sina.com.
authors.forename: Jinpei
authors.initials: J
authors.lastname: Ning
authors.affiliation: Department of Anatomy, Guangdong Provincial Medical Biomechanical Key Laboratory, Academy of Orthopedics of Guangdong Province, Southern Medical University, Guangzhou 510515, China e-mail: spdwwf@126.com.
authors.forename: Peidong
authors.initials: P
authors.lastname: Sun
authors.affiliation: Department of Anatomy, Guangdong Provincial Medical Biomechanical Key Laboratory, Academy of Orthopedics of Guangdong Province, Southern Medical University, Guangzhou 510515, China e-mail: 553545578@qq.com.
authors.forename: Jinyuan
authors.initials: J
authors.lastname: Zhang
authors.affiliation: Department of Orthopedic Surgery, The Affiliated Hospital of Putian University, Putian 351100, Fujian, China;Department of Orthopedic Surgery, The Affiliated Putian Hospital of Southern Medical University, Putian 351100, Fujian, China e-mail: wuchangfu360@163.com.
authors.forename: Changfu
authors.initials: C
authors.lastname: Wu
authors.affiliation: Department of Anatomy, Guangdong Provincial Medical Biomechanical Key Laboratory, Academy of Orthopedics of Guangdong Province, Southern Medical University, Guangzhou 510515, China e-mail: lybimail@126.com.
authors.forename: Zhenyu
authors.initials: Z
authors.lastname: Bi
authors.affiliation: Department of Anatomy, Guangdong Provincial Medical Biomechanical Key Laboratory, Academy of Orthopedics of Guangdong Province, Southern Medical University, Guangzhou 510515, China e-mail: 793649633@qq.com.
authors.forename: Jihong
authors.initials: J
authors.lastname: Fan
authors.affiliation: Department of Orthopedic Surgery, Wenzhou Hospitals of Traditional Chinese and Western Medicine, Wenzhou 325000, Zhejiang, China e-mail: 303476292@qq.com.
authors.forename: Xianliang
authors.initials: X
authors.lastname: Lai
authors.affiliation: Professor Department of Anatomy, Guangdong Provincial Medical Biomechanical Key Laboratory, Academy of Orthopedics of Guangdong Province, Southern Medical University, No. 1023 Shatai Road, Baiyun District, Guangzhou 510515, China e-mail: jouyang@126.com.
authors.forename: Jun
authors.initials: J
authors.lastname: Ouyang
mesh_terms: D001863:Bone Screws; D002574:Cervical Vertebrae / Q000502:physiology / Q000601:surgery*; D020342:Finite Element Analysis; D055595:Mechanical Phenomena; D016059:Range of Motion, Articular; D013314:Stress, Mechanical