PSI - Issue 42

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2019) 000 – 000 Available online at www.sciencedirect.com ^ĐŝĞŶĐĞ ŝƌĞĐƚ

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Procedia Structural Integrity 42 (2022) 1266–1273

23 European Conference on Fracture - ECF23 Development of a fused filament fabricated bioabsorbable interference screw for anterior cruciate ligament regeneration Guilherme Opinião a , Manuel Sardinha b , Nuno A. Ribeiro c , M. Fátima Vaz b , Luís Reis b,*

a IST, Instituto Superior Técnico, Universidade de Lisboa, Av Rovisco Pais, 1049−001 Lisbon, Portugal. b IDMEC, Instituto Superior Técnico, Universidade de Lisboa, Av Rovisco Pais, 1049−001 Lisbon, Portugal . c Hospital Lusíadas Lisboa, R. Abílio Mendes 12, 1500-458 Lisboa.

© 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the 23 European Conference on Fracture – ECF23 Abstract In this work, the design and development of a bioabsorbable interference screw used in Anterior Cruciate Ligament (ACL) reconstruction is proposed. This interference screw is perforated along its length with holes that have an elliptical geometry to allow a calcium triphosphate-based bone cement to be introduced. Several screw geometries, with different thread geometries, different pitch, different drive geometries and different hole geometries, were created using a 3D CAD modeling software and analyzed using a finite element analysis (FEA) program to assess which geometry provides the most favorable mechanical performance to the implant. Selected screw geometries were produced using fused filament fabrication (FFF) and insertion tests were performed. During insertion, screws were tested in holes with variable diameters, and the maximum torque achieved in each test was recorded. Tests show that most failures started in the areas close to one of the holes of the implant. In the future, results should be improved to allow FFF bioabsorbable interference screws to be a solution that promotes early rehabilitation during ACL reconstruction. © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of 23 European Conference on Fracture - ECF23 Keywords: Bioabsorbable; Insertion; FEA; tightening torque; Additive Manufacturing. 1. Introduction The knee is the largest and the most complex joint in the human body, where three bones of the lower limb meet: the femur, tibia, and patella. s.

* E-mail address: luis.g.reis@tecnico.ulisboa.pt

2452-3216 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of 23 European Conference on Fracture - ECF23

2452-3216 © 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the 23 European Conference on Fracture – ECF23 10.1016/j.prostr.2022.12.161