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On the mechanical aspect of additive manufactured polyether-ether-ketone scaffold for repair of large bone defects

Biomaterials Translational 2022年第2期3卷 142-151页

作者： Seyed Ataollah Naghavi Changning Sun Mahbubeh Hejazi Maryam Tamaddon Jibao Zheng Leilei Wang Chenrui Zhang Swastina Nath Varma Dichen Li Mehran Moazen Ling Wang Chaozong Liu Institute of Orthopaedic&Musculoskeletal Science University College LondonRoyal National Orthopaedic HospitalLondonUK State Key Laboratory for Manufacturing Systems Engineering School of Mechanical EngineeringXi’an Jiaotong UniversityXi’anShaanxi ProvinceChina Department of Mechanical Engineering University College LondonLondonUK.

Polyether-ether-ketone(peek)is widely used in producing prosthesis and have gained great attention for repair of large bone defect in recent years with the development of additive *** is due to its excellent biocompatibility,good heat and chemical stability and similar mechanical properties which mimics natural *** this study,three replicates of rectilinear scaffolds were designed for compression,tension,three-point bending and torsion test with unit cell size of 0.8 mm,a pore size of 0.4 mm,strut thickness of 0.4 mm and nominal porosity of 50%.Stress-strain graphs were developed from experimental and finite element analysis *** Young’s modulus and yield strength of the scaffolds were measured from the slop of the stress-strain graph to be 395 and 19.50 MPa respectively for compression,427 and 6.96 MPa respectively for tension,257 and 25.30 MPa respectively for three-point bending and 231 and 12.83 MPa respectively for torsion *** finite element model was found to be in good agreement with the experimental *** fracture of the struct subjected to tensile strain was the main failure mode of the peek scaffold,which stems from the low crystallinity of additive manufacturing *** mechanical properties of porous peek are close to those of cancellous bone and thus are expected to be used in additive manufacturing peek bone implants in the future,but the lower yield strength poses a design challenge.

关键词： additive manufacturing bone scaffold finite element analysis mechanical behaviour lattice structure peek scaffold

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