Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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Effect of the Radius of Curvature on the Contact Pressure Applied to the Endplate of the Sliding Core in an Artificial Intervertebral Disc

인공추간판 슬라이딩 코어의 곡률반경 변화가 종판의 접촉압력에 미치는 영향

  • 김철웅 (고려대학교 공학기술연구소, (주)트리플씨메디칼)
  • Received : 2011.06.20
  • Accepted : 2011.10.21
  • Published : 2012.01.01
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Abstract

The treatments for spinal canal stenosis are radicular cyst removal, spine fusion, and implantation of an artificial intervertebral disc. Artificial intervertebral discs have been most widely used since the mid-2000s. The study of artificial intervertebral discs has been focused on the analysis of the axial rotation, lateral bending, the degrees of freedom of the disc, and flexion-extension of the vertebral body. The issue of fatigue failure years after the surgery has arisen as a new problem. Hence, study of artificial intervertebral discs must be focused on the fatigue failure properties and increased durability of the sliding core. A finite element model based on an in the artificial intervertebral disc (SB Charit$\acute{e}$ III) was produced, and the influence of the radius of curvature and the change in the coefficient of friction of the sliding core on the von-Mises stress and contact pressure was evaluated. Based on the results, new artificial intervertebral disc models (Models-I, -II, and -III) were proposed, and the fatigue failure behavior of the sliding core after a certain period of time was compared with the results for SB Charit$\acute{e}$ III.

척추관 협착증은 감압술과 융합술 그리고 인공추간판 치환술 등이 있으며, 2000년대 중반부터는 인공추간판 치환술이 널리 시술되고 있다. 인공추간판의 연구는 추간판의 자유도 및 추체의 굴곡-신전, 측굴전, 축회전에 대한 해석이 핵심기술이지만, 시술 후 수년이 경과하여 발생하는 피로파손이 새롭게 큰 문제점으로 대두되고 있다. 따라서 인공추간판 연구는 슬라이딩 코어의 피로특성 및 내구성 향상에 집중되어야 한다. 본 연구에서는 세계적으로 가장 많이 사용되는 인공추간판 제품(SB Charit$\acute{e}$ III)을 기초로 유한요소모델을 제작하고, 슬라이딩 코어의 곡률반경과 마찰계수의 변화가 von-Mises 응력과 접촉압력에 미치는 영향을 평가하였다. 이와 같은 결과를 바탕으로 새로운 인공추간판 모델들 (Model-I, -II, -III)을 제안하고 일정수명 후 발생할 수 있는 슬라이딩 코어의 피로파손 거동에 대해 SB Charit$\acute{e}$ III의 결과와 비교 평가하였다.

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References

  1. Kleuver, D. E., Oner, F. C., and Jacobs, W. C. H., 2003, "Total Disc Replacement for Chronic Low Backpain: Background and Systematic Review of the Literature," Eur. Spine J., Vol.12, pp.108-116.
  2. Steven M. Kurtz, John Peloza, Ryan Siskey and Marta L. Villarraga, 2005, "Analysis of a Retrieved Polyethylene Total Disc Replacement Component," The spine journal 5, pp.344-350. https://doi.org/10.1016/j.spinee.2004.11.011
  3. Wiltse L. L., Winter R. B., 1983, "Terminology and Meaurement of Spondylolisthesis," The Journal of Bone and Joint Surgery, Vol.65, No.6, pp. 768-772. https://doi.org/10.2106/00004623-198365060-00007
  4. D. J. Choi, D. K. Ahn, S. Lee, K. Y. Park, Y. W. Jun and K. S. Kim, 2007, "Operative Treatment of Delayed Collapse of Osteoporotic Vertebral Fracture with Claudication, -Transpedicular Bone Graft and Pedicle Screw Fixation-," Journal of Korean Spine Surg., Vol.14, No.2, pp.73-78. https://doi.org/10.4184/jkss.2007.14.2.73
  5. N. H. Kim, S. H. Moon, H.M. Lee and D.H. Kim, 1998, "Spinal Dimensions and Shape Variation in Koreans Radiographic Quantitative Morphometry," Journal of Korean Orthopaedics, Vol.33, pp. 1611-1619.
  6. Dolan P., Adams M. A., 2001, "Nonlinear Stress Analysis of the Whole Lumbar Spine in Torsion- Mechanics of Facet Articulation," Spine, Vol.27, pp.289-299.
  7. W. M. Park, J. W. Joo, K. S. Kim, K. S. Lee and Y. H. Kim, 2009, "Biomechanical Characteristics of Cervical Spine After Total Disc Replacement," Transactions of the KSME(A), Vol. 33, No. 7, pp. 637-644. https://doi.org/10.3795/KSME-A.2009.33.7.637
  8. Kim, Y. E., Yun, S. S., and Jung, S. K., 2006, "Biomechanical Analysis of the Implanted Constrained and Unconstrained ICR Types of Artificial Disc using FE Model," Journal of the Korean Society of Precision Engineering, Vol. 23, No. 4, pp.176-182.
  9. Cho, C. H., Cho, Y. K., Choi, J. B., Lee, T. S., and Choi, K., 1998, "A Biomechanical Study on the Tibial Components Under Dynamic Loading," Spring Conference of the KSME(A), pp.368-373.
  10. Samyn, P., Van Schepdael, L., Leendertz, J. S., Gerber, A., Van Paepegem, W., De Baets, P., and Degrieck, J., 2006, "Large-Scale Friction and Wear Tests on a Hybrid UHMWPE-Pad/Primer Coating Combination used as Bearing Element in an Extremely High-Loaded Ball-Joint," Tribology International 39, pp.796-811. https://doi.org/10.1016/j.triboint.2005.07.009
  11. Cho, H. J., Wei, W. J., Kao, H. C., and Cheng, C. K., 2004, "Wear Behavior of UHMWPE Sliding on Artificial Hip Arthroplasty Materials," Materials Chemistry and Physics 88, pp.9-16. https://doi.org/10.1016/j.matchemphys.2003.10.021
  12. Jun Yao, Sergio R. Turteltaub, and Paul Ducheyne, 2006, "A Three-dimensional Nonlinear Finite Element Analysis of the Mechanical Behavior of Tissue Engineered Intervertebral Discs Under Complex Loads," Biomaterials 27, pp.377-387. https://doi.org/10.1016/j.biomaterials.2005.06.036
  13. Bogduk, N., Twomey, L. T., 1997, "Clinical Anatomy of the Lumbar Spine and Sacrum," Churchill Livingston.