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Biomechanical comparison of the angle of inserted screws and the length of anterior cervical plate systems with allograft spacers

Authors
 Ji-Won Kwon  ;  Sun-Hee Bang  ;  Young-Woo Kwon  ;  Jae-Yong Cho  ;  Tae-Hyun Park  ;  Sung-Jae Lee  ;  Hwan-Mo Lee  ;  Seong-Hwan Moon  ;  Byung Ho Lee 
Citation
 CLINICAL BIOMECHANICS, Vol.76 : 105021, 2020-06 
Journal Title
 CLINICAL BIOMECHANICS 
ISSN
 0268-0033 
Issue Date
2020-06
Keywords
Allograft spacers ; Anterior cervical discectomy ; Finite element mode ; Plate ; Screw
Abstract
Background: Comparative studies of the biomechanical effects of plates of varying lengths and different screw insertion angles on allograft spacers are lacking. Methods: Finite element model analysis of a previously validated, three-dimensional, intact cervical spinal segment model of C3-6 was conducted in the present study. On the C5-6 segment, anterior discectomy and fusion were performed using allograft spacers and different combinations of anterior plates and screws. The biomechanical characteristics of combinations of short, medium, and maximal length plates with screw insertion angles of 0°, 8°, 16°, and 32° were analyzed. Findings: In flexion and extension, the risk of allograft spacer subsidence decreased as screw angles increased. Short plates with a screw insertion angle of 32° posed the lowest subsidence risk, similar to medium length plates with a screw insertion angle of 16°, in all motion conditions. The risk of bone yielding increased as plate length increased, but decreased as the screw insertion angle increased. Interpretation: Short plates with a large screw insertion angle (32°) showed the highest mechanical stability and load sharing of allograft spacers and the lowest risk of screw loosening. Accordingly, we recommend the use of a short plate and large screw insertion angle for anterior cervical discectomy and fusion.
Full Text
https://www.sciencedirect.com/science/article/pii/S0268003320301303
DOI
10.1016/j.clinbiomech.2020.105021
Appears in Collections:
1. College of Medicine (의과대학) > Dept. of Orthopedic Surgery (정형외과학교실) > 1. Journal Papers
Yonsei Authors
Kwon, Ji-Won(권지원) ORCID logo https://orcid.org/0000-0003-4880-5310
Moon, Seong Hwan(문성환)
Lee, Byung Ho(이병호) ORCID logo https://orcid.org/0000-0001-7235-4981
Lee, Hwan Mo(이환모) ORCID logo https://orcid.org/0000-0002-5405-3832
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/180702
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