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The Optimum Design and Mechanical Test of the Novel Cannulated Pedicle Screw

Author: JiaZongHai
Tutor: LuQingLin
School: Shandong University
Course: Surgery
Keywords: Pedicle screw Design Finite Element Analysis Osteoporosis Biomechanics
CLC: R687.3
Type: Master's thesis
Year: 2011
Downloads: 13
Quote: 0
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Abstract


Objective To investigate the pourable pedicle screw hole diameter size and distribution on the screw side hole mechanical strength, as well as self-designed new pourable pedicle screws in osteoporotic vertebral body biomechanical stability. Materials and methods based on universal spine system (General Spine System, GSS) pedicle screw geometry data and perfusion pedicle screw design ideas, establish common pedicle screws and perfusion limited pedicle screw metamodel. Screws were simulated cantilever bending, tension and torsion tests to analyze pourable pedicle screw hole diameter pore size distribution and side effects on the mechanical strength of the screw, and identify the optimal perfusion of pedicle screws and the side hole diameter distribution. According to the results of simulation to design and produce physical screws. Select the age of 65-85 years old full wet L14 vertebrae specimens 5, a total of 20 vertebrae, mean BMD was 0.644 ± 0.071g/cm2. Randomly selected side of each vertebra pedicle into self-designed pourable pedicle screws and bone cement perfusion through supporting equipment within the vertebral bone cement injected about 3-5ml, as pourable pedicle screw fixation group strengthened. Random the other side of all vertebral pedicle pedicle screw fixation group is divided into ordinary and general strengthening pedicle screw fixation group, n = 10 pedicle. Ordinary pedicle screw fixation group Xianxiang strengthen nails tract 3-5ml injection of bone cement and then screwed into the common pedicle screws. Respectively, the largest of the three rows of screws axial pullout strength tests. Another common pedicle screws and perfusion of the eight screws, screw line cantilever bending test. Results 1. Ordinary pedicle screws and the hole diameter of 1.0mm, 1.5mm, 2.0mm, 2.5mm hollow pedicle screw models yield load was 994N, 1026N, 1120N, 1083N, 1064N. When the hole diameter is 1.5mm maximum yield load screw model, as an ordinary pedicle screw 113 percent. 2 hole diameter of 1.5mm, hole side of the hole as 3,4,6 pourable pedicle screw models yield load was 1046N, 997N, 1013N. Three screw model can withstand the maximum pulling force of 4950N, 4510N, 4675N; maximum torque of 10.3N · m, 8.7N · m, 9.9N · m. 3 can be enhanced perfusion pedicle screw fixation group osteoporotic vertebral screws in the maximum axial pullout strength and common pedicle screw fixation group, the difference was statistically significant (P lt; 0.01), with common vertebral strengthening pedicle screw fixation group difference was not statistically significant (P gt; 0.05). Ordinary pedicle screw fixation group and general strengthening pedicle screw conventional fixed difference was statistically significant (P lt; 0.01). Pourable enhanced pedicle screw fixation group, the vertebral left and right pedicle screws at the average maximum pullout force, the difference was not statistically significant (t = 0.234, P gt; 0.05). 4 pourable pedicle screws and ordinary screw anti-bending strength difference was not statistically significant (t = 1.049, P gt; 0.05). Conclusions 1 of which pore diameter of 1.0mm, 1.5mm, 2.0mm, 2.5mm, the hollow structure of the pedicle screw screw model anti-bending strength than ordinary pedicle screw increases. The open side of the hole so that the mechanical strength of the hollow screw models varying degrees of reduction. 2 hole diameter of 1.5mm, the side hole of the new 6-well pourable pedicle screw static mechanical strength and general pedicle screw is not significantly reduced compared to withstand the weight of the upper body, meet clinical needs. 3 new pedicle screw can be enhanced perfusion fixed in osteoporotic vertebral body with good anchoring effect, and can effectively control the leakage of bone cement, and has good prospects for clinical application.

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CLC: > Medicine, health > Surgery > Orthopaedic Surgery ( movement system diseases,orthopedic surgery ) > Orthopedic surgery and surgery > Bone surgery
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