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KMID : 0378019800230050095
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New Medical Journal
1980 Volume.23 No. 5 p.95 ~ p.100
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Model Design of Compression Metal Plate Used in Orthopedic Field
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Abstract
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A mathematical approach using the simple beam bending theory to study the mechanics of a plated transverse fracture is described. For the analytical modeling, the bone is assumed to be a cylindrical hollow beam on which an only plate is fixed by bone screws.
A system of simultaneous equations are derived for the deflection of bone and plate. The tendency of variations of the contact area due to change in design factors such as length, width and thickness of the plate, position of the screw holes, and force exerted on the screws are investigated.
The location of screw holes, length of plate and the amount of screw holding power are found to be dominant design parameter.
An optimal design problem is formulated to minimize the length moment arm in the fracture surface, which is related to contact area. The contact area becomes larger when the holding force in the second screw increases and those first and third are decreased. From the solution of optimal design problem for a given fractured bone, optimum length of the plate is found to be 110cm and optimal screw locations for 6 hole model plate are obtained as 20mm, 30mm and 45mm from the center of plate.
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