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The Effects of the Number of the Screw in the Plates on the Bending Stiffness of Plate and Screw Structure

Author: HuangJiang
Tutor: ShuYong
School: Nanchang University
Course: Surgery
Keywords: Dynamic compression plate Number of screw Stiffness Three - point bending test
CLC: R687.3
Type: Master's thesis
Year: 2006
Downloads: 42
Quote: 2
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Abstract


Objective: To investigate the number of screws on the structural stability of the bone plate and screw to provide experimental basis for clinical plate and screw application . Methods: thirty chestnut ( Chestnut / castaneamolliss ) of the samples were randomly divided into five groups , each group of six , each chestnut wood simulated transverse fracture , an 12 - hole dynamic compression plate symmetry fixed , fixed position : A group fixed 1-6 ; B fixed set of 1-2-6 ; C group fixed 1-2-3-6 ; the D group fixed 1-2-3-4-6 ; E fixed set of 1-2-3-4-5 -6 . Were parallel to the plate plane direction of the long axis of the three - point bending test on the material testing machine . Results: A group in the three - point bending experiment , the average strain fracture (895.67 ± 36.06με) maximum , average fracture strain in the E group (817.50 ± 26.83 με) Min . Average fracture strain of group A and C ( 842.17 ± 25.39με ) the D ( 827.00 ± 30.04με ) , group E group were significantly different (P <0.05); B (864.83 ± 35.28με) fracture average strain and D , E group were statistically significant differences ( P < 0.05 ) . Group A and group B , group B and group C , group C and D , C ​​and E group , group D and E fracture average strain there was no significant difference ( P > 0.05 ) . Conclusion: In the three - point bending experiment , the steel plate of the same length , the number of screw plate and screw structure stability of the system have a significant impact . The number of the screw reaches certain circumstances , increase the number of screws does not increase the stiffness of the structure .

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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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