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KMID : 0371619910070010085
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Journal of Wonkwang Medical Science
1991 Volume.7 No. 1 p.85 ~ p.90
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Change of Stainless Steel Plates after Fixation to the Fractured Femurs
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Abstract
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To estimate causative factors leading to failure of internal fixation devices, we performed mechanical, metallurgical and X-ray diffractionai studies of plates. The study included three unused, six used, and broken one during implantation to the fractured femurs.
Inner surfaces of used or broken plates revealed increased cracks and conversion of metal crystal from austenite to martensite structures, which implied that the plates became brittle.
The ultimate tensile strength of used plates was increased and it meaned that the stress during implantation within the body did not weaken the ultimate tensile strength of the plates, rather made them stiff and hard.
The used or broken plates were proved to lose their original ductility during implantation and became hard and brittle.
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