DESIGN OF NEW PEDICLE SCREW AND BIOMECHANICAL EVALUATION USING FINITE ELEMENT ANALYSIS


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Coşkun Z., Çelik T.

3 RD INTERNATIONAL CONFERENCE ON APPLIED ENGINEERING AND NATURAL SCIENCES, Konya, Turkey, 20 - 23 July 2022, vol.1, no.1, pp.567-568

  • Publication Type: Conference Paper / Summary Text
  • Volume: 1
  • City: Konya
  • Country: Turkey
  • Page Numbers: pp.567-568
  • Kocaeli University Affiliated: Yes

Abstract

Pedicle screw and rod systems are widely employed in spine surgeries, and damage to the pedicle

screw is observable. In this study, a commercially produced screw and a pedicle screw that was specifically

designed were compared in terms of their mechanical characteristics. The goal of this technique is to

analyze and estimate the results of surgery using three-dimensional models of bone implant constructs that

have been transformed into finite elements. Finite element analysis was used to assess and compare each

system's mechanical performance. The spinal cord was modeled in 3D using computerized tomography

(CT) images obtained from a voluntary taken from a Toshiba Aquilion CT scanner in the Department of

Radiology, School of Medicine at Kocaeli University. The images were segmented using MIMICS 12

(Materialise, Leuven, Belgium) 3D İmage Processing Software and the material properties were assigned

according to litarature. 3D bone model was imported into ANSYS Workbench (ANSYS Inc. Canonsburg,

PA) in cdb format. The screw dimensions were developed based on currently utilized commercial products.

Modeled screw and rod systems were placed into the spinal cord in accordance with the surgical process.

Force was applied over the rod and fixed made from the distal vertebra. In comparison to the reference

screw, the diameter and extrude degree of the design screw have increased. According to the analysis's

findings, the designed screw's maximum stress value is 96 MPa while the commercial screw's maximum

stress value is 225 MPa. The maximum stress on the vertebra for the reference and designed screw is 60.4

and 57.8, respectively. It was found from the results that the designed screw caused a reduction in the

maximum stress value on the spine. In conclusion, the findings of this study indicated that the designed

screw minimizes the chances of damage in spinal cord surgeries.