• World Neurosurg · Dec 2023

    Subsidence performance of the bioactive glass-ceramic (CaO-SiO2-P2O5-B2O3) spacer in terms of modulus of elasticity and contact area - mechanical test and finite element analysis.

    • Myoung Lae Jo, Dong Min Son, Dong Ah Shin, Bong Ju Moon, Baek Hyun Kim, and Kyung Hyun Kim.
    • CGBio Co. Ltd., Seoul, Republic of Korea; Department of Biomedical Engineering, Chungbuk National University, Cheongju, Republic of Korea.
    • World Neurosurg. 2023 Dec 1; 180: e1e10e1-e10.

    ObjectiveThe objective of this study is to evaluate the subsidence performance of a bioactive glass-ceramic (CaO-SiO2-P2O5-B2O3) spacer in terms of its modulus of elasticity and contact area using mechanical tests and finite element analysis.MethodsThree spacer three-dimensional models (Polyether ether ketone [PEEK]-C: PEEK spacer with a small contact area; PEEK-NF: PEEK spacer with a large contact area; and Bioactive glass [BGS]-NF: bioactive glass-ceramic spacer with a large contact area) are constructed and placed between bone blocks for compression analysis. The stress distribution, peak von Mises stress, and reaction force generated in the bone block are predicted by applying a compressive load. Subsidence tests are conducted for three spacer models in accordance with ASTM F2267. Three types of blocks measuring 8, 10, and 15 pounds per cubic foot are used to account for the various bone qualities of patients. A statistical analysis of the results is conducted using a one-way Analysis of variance and post hoc analysis (Tukey's Honestly Significant Difference) by measuring the stiffness and yield load.ResultsThe stress distribution, peak von Mises stress, and reaction force predicted via the finite element analysis are the highest for PEEK-C, whereas they are similar for PEEK-NF and BGS-NF. Results of mechanical tests show that the stiffness and yield load of PEEK-C are the lowest, whereas those of PEEK-NF and BGS-NF are similar.ConclusionsThe main factor affecting subsidence performance is the contact area. Therefore, bioactive glass-ceramic spacers exhibit a larger contact area and better subsidence performance than conventional spacers.Copyright © 2023 The Authors. Published by Elsevier Inc. All rights reserved.

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