椎弓足骨螺絲彎曲強度之生物力學測試與有限元素分析

蘇芳正

doi:10.6342/NTU.2005.01648

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椎弓足骨螺絲彎曲強度之生物力學測試與有限元素分析

Biomechanical Tests and Finite Element Analysis for Bending Strength of Pedicle Screws

蘇芳正 , Masters　　Advisor：王兆麟　　Co-advisor ：林晉

繁體中文 DOI： 10.6342/NTU.2005.01648

椎弓足骨螺絲；錐度；生物力學測試；有限元素分析； Pedicle screw ； Taper ； Biomechanical test ； Finite element analysis

Abstract │ Reference (35) │ Times Cited (1) │ Altmetrics

Abstract 〈TOP〉

Parallel Abstract 〈TOP〉

Pedicle screws have been used popularly in spinal surgery. In clinical point of view, the pedicle screw may break after a short span of the surgical operation because of cyclic loading of upper body weight. Therefore, designing the pedicle screw with a good bending strength is becoming an important issue.
Ten types of pedicle screws were designed and manufactured in this study. The bending strength of those pedicle screws was investigated by biomechanical tests and finite element analysis. In biomechanical tests, the pedicle screws were inserted into the ultrahigh molecular polyethylene cylinder and the insertion length of pedicle screw was 40 mm. Static-load yielding tests and cyclic-load fatigue tests were conducted. The yielding load, stiffness, fatigue life, and multi-cycle stiffness of each screw were recorded. In finite element analysis, three-dimensional finite element models were established by ANSYS to simulate the biomechanical tests. The finite element models consisted of the pedicle screw and polyethylene cylinder. A point load of 220 N was applied on the polyethylene cylinder and the peripheral margin of the screw head was fully constrained. The interfaces between pedicle screw and polyethylene cylinder were contact. In post processing, the maximal tensile stress, maximal deflection, and total strain energy of finite element models were derived. The convergent study of finite element models was evaluated and the correlation study between biomechanical tests and finite element analysis was assessed.
From the results of biomechanical tests, the screw with larger taper length has higher yielding strength, stiffness, multi-cycles stiffness, and fatigue life. The conical screw has higher bending strength performance than the cylindrical screw. Increasing the inner diameter could increase the bending strength. From the results of finite element analysis, the screw with larger taper length has smaller maximal tensile stress, maximal deflection, and total strain energy. The conical screw with larger inner diameter has smaller maximal tensile stress, maximal deflection, and total strain energy. All of the finite element models were convergent. In correlation study, the maximal deflection or total strain energy in finite element analysis was closely related to the yielding strength with a high correlation coefficient of –0.914. The maximal tensile stress in finite element simulation was closely related to the logarithm of fatigue life with a high correlation coefficient of –0.928. In conclusion, developing the finite element models in this study could be used to reflect the results of biomechanical tests. This result can assist surgeons in selecting suitable devices for patients.

Reference ( 35 ) 〈TOP〉

4. Gaines R.W., "The use of pedicle-screw internal fixation for the operative treatment of spinal disorders (Current Concepts Review)". The Journal of Bone and Joint Surgery, 2000. 82-A(10): p. 1458-76.
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5. Krag M.H., "Biomechanics of thoracolumbar spinal fixation (A Review)". Spine, 1991. 16(3): p. S84-S97.
連結：
6. Harrington P.R. and H.S. Tullos, "Reduction of severe spondylolisthesis in children". South Med J, 1969. 62: p. 1-7.
連結：
7. Roy-Camille R., G. Saillant, and M. C., "Internal fixation of the lumbar spine with pedicle screw plating". Clinical Orthopedic and Related Research, 1986. 203: p. 7-17.
連結：
8. Ashman R.B., R.D. Galpin, J.D. Corin, and C.E. Johnston, 2nd, "Biomechanical analysis of pedicle screw instrumentation systems in a corpectomy model". Spine, 1989. 14(12): p. 1398-405.
連結：

Times Cited (1) 〈TOP〉

蘇崇瑋(2012)。微創椎弓根螺釘補強之最佳化分析。中央大學機械工程學系學位論文。2012。1-84。

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