Biomechanical Assessment of Three Osteosynthesis Constructs by Periprosthetic Humerus Fractures. (26th October 2020)

• Record Type: Journal Article
• Authors: Harb, Afif; Welke, Bastian; Liodakis, Emmanouil; Razaeian, Sam; Zhang, Dafang; Krettek, Christian; Hurschler, Christof; Hawi, Nael
• Other Names: Blondel Benjamin Academic Editor.
• Is Part Of: Advances in orthopedics. Volume 2020(2020)
• Publication Date: 2020-10-26
• Subjects: Orthopedics -- Periodicals; Orthopedics; Orthopedic Procedures; Orthopedics; Electronic journals; Periodicals; Periodicals; 616.7
• DOI: 10.1155/2020/8872419
• Languages: English
• ISSNs: 2090-3464

Abstract

Abstract : Background . Biomechanical stability assessment of 3 different constructs for proximal fixation of a locking compression plate (LCP) in treating a Worland type C periprosthetic fracture after total shoulder arthroplasty. Methods . 27 Worland type C fractures after shoulder arthroplasty in synthetic humeri were treated with 14-hole LCP that is proximally fixed using the following: (1) 1 × 1.5 mm cerclage wires and 2x unicortical-locking screws, (2) 3 × 1.5 mm cerclage wires, or (3) 2x bicortical-locking attachment plates. Torsional stiffness was assessed by applying an internal rotation moment of 5 Nm and then after unloading the specimen, an external rotation moment of 5 Nm at the same rate was applied. Axial stiffness was assessed by applying a 50 N preload, and then applying a cyclic load of 250 N, then increasing the load by 50 N each time, until a maximum axial load of 2500 N was reached or specimen failure occurred. Results . With regard to internal as well as external rotational stiffness, group 1 showed a mean stiffness of 0.37 Nm/deg and 0.57 Nm/deg, respectively, group 2 had a mean stiffness of 0.51 Nm/deg and 0.39 Nm/deg, respectively, while group 3 had a mean stiffness of 1.34 Nm/deg and 1.31 Nm/deg, respectively. Concerning axial stiffness, group 1 showed an average stiffness of 451.0 N/mm, group 2 had a mean stiffness of 737.5 N/mm, whereas group 3 had a mean stiffness of 715.8 N/mm. Conclusion . Group 3 displayed a significantly higher torsional stiffness while a comparable axial stiffness to group 2.