Pull out Performance of Medical Screws used in Orthopaedic Surgeries

Yıl 2016, Cilt: 31 Sayı: ÖS2, 221 - 228, 15.10.2016

Durmuş Ali Bircan , Ahmet Çetin

https://doi.org/10.21605/cukurovaummfd.316776

Öz

In this study, a new medical bone screw was designed and manufactured by Ti6Al4VELI GR23 material and tested in accordance with the ATSM F 543-02 test procedure experimentally. This test is used to measure the axial tensile force required to fail or remove a bone screw from a defined material. Concurrently, 3-D Finite Element Analysis (FEA) models of these medical bone screws were developed to simulate and biomechanically evaluate the pull-out forces and stiffness of the screw samples using FEA software ANSYS. Obtained results from the FEA models are in reasonable agreement with the experimental data on the pull-out strength of the medical bone screw. Results from FE models are experimentally verified.

Anahtar Kelimeler

Medical screws, Finite element analysis (FEA), Pull-out, Biomechanics

Ortopedik Operasyonlarda Kullanılan Medikal Vidaların Sıyırma Performansı

Öz

Bu çalışmada, Ti6Al4Veli GR23 malzemesi kullanılarak yeni bir medikal vida tasarlanmış, ASTM-543-02 test prosedürüne uygun test edilmiş ve üretilmiştir. Bu testte tanımlanan bir malzemeden vidanın kırılmasını veya kemik malzemeden ayrılmasına neden olan kritik eksenel kuvvet hesaplanır. Aynı zamanda, tasarlanan vidanın üç boyutlu sonlu elemanlar modeli ANSYS programı kullanılarak sıyırma kuvvetleri ve dayanımları değerlendirilmek ve simule edilmek için oluşturuldu. Sonlu elemanlar modelinden elde edilen sonuçlar deneysel sıyırma mukavemeti sonuçlarıyla uygunluk göstermiştir. Böylece sonlu elemanlar ile elde edilen sonuçlar deneysel olarak doğrulanmıştır.

Anahtar Kelimeler

Medikal vidalar, Biyomekanik, Sonlu elemanlar yöntemi, Sıyırma

Kaynakça

• 1. Battula, S., Schoenfeld, A., Vrabec, G., Njus, G. O., 2006. Experimental Evaluation of the Holding Power/Stiffness of the Self-tapping Bone Screws in Normal and Osteoporotic Bone Material, Clinical Biomechanics, 21, pp. 533–537.
• 2. Hsu, C.C., Chao, C.K., Wang, J.L., Hou, S.M., Tsai, Y.T., Lin, J., 2005. Increase of Pullout Strength of Spinal Pedicle Screws with Conical Core: Biomechanical Tests and Finite Element Analyses, Journal of Orthopaedic Research, 23, pp. 788–794.
• 3. Chapman, J.R., Harrington, R.M., Lee, K.M., Anderson, P.A., Tencer, A.F., Kowalski, D., 1996. Factors Affecting the Pullout Strength of Cancellous Bone Screws, Journal of Biomechanical Engineering, August, 118, pp. 391-398.
• 4. Kim, Y., Choi, W., Rhyu, K., 2012. Assessment of Pedicle Screw Pullout Strength Based on Various Screw Designs and Bone Densities-an Ex Vivo Biomechanical Study, The Spine Journal, 12, pp. 164–168.
• 5. Amaritsakul, Y., Chao, C., Jin, C., 2014. Comparison Study of the Pullout Strength of Conventional Spinal Pedicle Screws and a Novel Design in Full and Backed-out Insertions using Mechanical Tests, Proc IMechE Part H:J Engineering in Medicine, 228(3) pp. 250–257.
• 6. Inceoglu, S., Kılınçer, C., McLain, R.F., 2008. Screw Design Alters the Effects of Stress Relaxation on Pullout, Bio-Medical Materials and Engineering, 18, pp. 53–60.
• 7. Yaman, O., Demir, T., Arslan, A.K., İyidiker, M.E., Tolunay, T., Camuscu, N., Ulutas, M., 2015. The Comparison of Pullout Strengths of Various Pedicle Screw Designs on Synthetic Foams and Ovine Vertebrae, Turk Neurosurg, 25, 4, pp. 532-538.
• 8. Perren, S.M., 2002. Evolution of the Internal Fixation of Long Bone Fractures, The Scientific Basis of Biological Internal Fixation: choosing a new balance between stability and biology, J Bone Joint Surg., 84B, pp. 1093-1110.
• 9. Chatzistergos, P.E., Magnissalis, E.A., Kourkoulis, S.K., 2010. A parametric Study of Cylindrical Pedicle Screw Design Implications on the Pullout Performance using an Experimentally Validated Finite-element Model, Medical Engineering & Physics, 32, pp. 145–154.
• 10. Chao, C.K., Hsu, C.C., Wang, J.L., Lin, J., 2008. Increasing Bending Strength and Pullout Strength in Conical Pedicle Screws: Biomechanical Tests and Finite Element Analyses, Spinal Disord Tech, 21, 2, pp. 130-138.
• 11. Feerick, E.M., McGarry, P., 2012. Computational Study of Cortical Bone Screw Pullout using the Extended Finite Element Method (XFEM), 2012 SIMULIA Community Conference.
• 12. Zdero, R., Rose, S., Shcemitsch, E. H., Papini, M., 2007. Cortical Screw Pullout Strength and Effective Shear Stress in Synthetic Third Generation Composite Femurs, ASME J. Biomech. Eng., 129, pp. 289–293.
• 13. Krenn, M.H., Piotrowski, W.P., Penzkofer, R., Augat, P., 2008. Influence of Thread Design on Pedicle Screw Fixation, J Neurosurg Spine, 9, pp. 90–95.
• 14. ASTM F543-02, 2009. Standard Specification and Test Methods for Metallic Medical Bone Screws, Annual Books of ASTM Standards, Volume 13.01, American Society for Testing and Materials, Philadelphia, pp. 134–153.
• 15. Edidin, A.A., Kurtz, S.M., 2000. Influence of Mechanical Behavior on the Wear of 4 Clinically Relevant Polymeric Biomaterials in a Hip Simulator, The Journal of Arthroplasty, 15, 3, pp. 321-331.