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Biomechanical and finite element analyses of bone cement‐Injectable cannulated pedicle screw fixation in osteoporotic bone
Author(s) -
Liu Yaoyao,
Xu Jianzhong,
Sun Dong,
Luo Fei,
Zhang Zehua,
Dai Fei
Publication year - 2016
Publication title -
journal of biomedical materials research part b: applied biomaterials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.665
H-Index - 108
eISSN - 1552-4981
pISSN - 1552-4973
DOI - 10.1002/jbm.b.33424
Subject(s) - materials science , bone cement , fixation (population genetics) , cancellous bone , biomechanics , bending , bending stiffness , finite element method , initial stability , stiffness , osteoporosis , bending moment , stress (linguistics) , cement , composite material , orthodontics , biomedical engineering , structural engineering , medicine , implant , surgery , engineering , anatomy , population , linguistics , philosophy , environmental health , endocrinology
The objectives of this study were to investigate the safety and biomechanical stability of a polymethylmethacrylate (PMMA)‐augmented bone cement‐injectable cannulated pedicle screw (CICPS) in cancellous bone model, and to analyze the stress distribution at the screw‐cement‐bone interface. The OMEGA cannulated pedicle screw (OPS) and conventional pedicle screw (CPS) were used as control groups. Safety of the CICPS was evaluated by the static bending and bending fatigue tests. Biomechanical stability was analyzed by the maximum axial pullout strength and maximum torque tests. Stress distribution at the screw–cement–bone interface was analyzed by the finite element (FE) method. The CICPS and CPS produced statistically similar values for bending stiffness, bending structural stiffness, and bending yield moment. The maximum pullout force was 53.47 ± 8.65 N in CPS group, compared to 130.82 ± 7.32 N and 175.45 ± 43.01 N in the PMMA‐augmented OPS and CICPS groups, respectively ( p < 0.05). The CICPS had a significantly greater torque than the OPS and CPS. The FE model did not reveal excessive stress at the screw‐cement‐bone interface in the CICPS group. In conclusion, PMMA‐augmentation with CICPS may be a potentially useful method to increase the stability of pedicle screws in patients with osteoporosis. © 2015 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 104B: 960–967, 2016.