ArticleThe International journal, advanced manufacturing technology2026
Investigating the potential of auxetic structures in tibial insert toward multi-range load-carrying knee implant.
Article in The International journal, advanced manufacturing technology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
The artificial tibial insert degrades within the human body over service time as a metallic femoral surface continues articulating against it. The degradation rate depends on gait patterns and mainly on the human body weight, as tibial inserts normally lack subject-specific customisation. This article investigates the feasibility of gyroid, square anti-chiral, and triangular auxetic structures for tibial insert applications. The mechanical performance of new tibial designs is compared against a conventional (bulk) tibial insert through computational and experimental studies. The preliminary stress-strain and deformation behaviours are studied with ANSYS Workbench. Whereas the Instron machine is used for experimental studies to test the 3D printed conventional and auxetic structure-based tibial inserts designed in this work. The experimental studies are performed under a wide range of quasi-static and cyclic loading conditions to understand their mechanistic performance and suitability for knee joint functionality. Among gyroid, square anti-chiral and triangular auxetic structures, the triangular design has demonstrated exceptional load-bearing capabilities up to 20 kN, an adequate deflection up to 2.3 mm, along with 34.8% reduction in component weight. The enhanced elastic recovery supported by auxetic structures can provide knee safety under impact loads. In addition, it is perceived that the auxetic structures-based tibial insert provides tunable effective stiffness, demonstrating the significance of auxetic lattice design and their suitability for a wider range of body weights to ensure mechanical stability, medical safety, and implant longevity.
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