Biomaterials Translational ›› 2022, Vol. 3 ›› Issue (2): 142-151.doi: 10.12336/biomatertransl.2022.02.006

• RESEARCH ARTICLE • Previous Articles     Next Articles

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

Seyed Ataollah Naghavi1, Changning Sun2, Mahbubeh Hejazi3, Maryam Tamaddon1, Jibao Zheng2, Leilei Wang2, Chenrui Zhang2, Swastina Nath Varma1, Dichen Li2, Mehran Moazen3, Ling Wang2,*(), Chaozong Liu1,*()   

  1. 1 Institute of Orthopaedic & Musculoskeletal Science, University College London, Royal National Orthopaedic Hospital, London, UK
    2 State Key Laboratory for Manufacturing Systems Engineering, School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an, Shaanxi Province, China
    3 Department of Mechanical Engineering, University College London, London, UK
  • Received:2022-05-04 Revised:2022-06-02 Accepted:2022-06-09 Online:2022-06-28 Published:2022-06-28
  • Contact: Ling Wang,Chaozong Liu E-mail:menlwang@mail.xjtu.edu.cn;chaozong.liu@ucl.ac.uk
  • About author:Chaozong Liu, chaozong.liu@ucl.ac.uk.
    Ling Wang, menlwang@mail.xjtu.edu.cn;
    First author contact:#Author Equally.


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 manufacturing. This is due to its excellent biocompatibility, good heat and chemical stability and similar mechanical properties which mimics natural bone. In 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 models. Experimental 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 test. The finite element model was found to be in good agreement with the experimental results. Ductile 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 PEEK. The 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.

Key words: additive manufacturing, bone scaffold, finite element analysis, mechanical behaviour, lattice structure, PEEK scaffold