Fracture analysis of retrieved orthopedic wires

Baswell, Imogene L.; Sander, Tom; Allen, Ben L.; Bechtol, Charles O.

doi:10.1002/jbm.820200704

Cited by 8 publications

(2 citation statements)

References 13 publications

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“…The presence of surface defects could dramatically change the corrosion resistance and significantly alter the mechanical properties of a component. [14][15][16][17][18][19] Therefore, a combination of corrosion and cyclic loading could destroy the wire, resulting in an unpredictably short service life and enormous release of harmful corrosion products.…”

Section: Surface Defectsmentioning

confidence: 99%

Increased corrosion resistance of stent materials by converting current surface film of polycrystalline oxide into amorphous oxide

Shih

Lin

Chung

et al. 2000

J. Biomed. Mater. Res.

103

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Current efforts of new stent technology have been aimed largely at the improvement of intravascular stent biocompatibility. Among the chemical characteristics of metallic stents, surface oxide corrosion properties are paramount. Using our unique technique, the currently marketed 316 L stainless steel and nitinol stent wires covered with polycrystalline oxide were chemically etched and then passivated to form amorphous oxide. Excellent metallic-stent corrosion resistance with an amorphous oxide surface was demonstrated in our previous in vitro study. For in vivo validation, we compared the corrosion behavior of different oxide surfaces on various forms of test wires in the abdominal aorta of mongrel dogs using open-circuit potential and cyclic anodic polarization measurements. After conduction, the retrieved test wires were observed under scanning electron microscope. No passivity breakdown was found for wires covered with amorphous oxide, while wires with polycrystalline oxide showed breakdown at potentials between +0.2 to + 0.6 V. It has been proven that severe pitting or crevice corrosion occurred on the surface of polycrystalline oxide, while the surface of amorphous oxide was free of degradations in our experiment. We have demonstrated that this amorphous oxide coating on metallic material provides better corrosion resistance, not only in vitro but also in vivo, and it is superior not only in strength safety but also in medical device biocompatibility.

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Section: Surface Defectsmentioning

confidence: 99%

Increased corrosion resistance of stent materials by converting current surface film of polycrystalline oxide into amorphous oxide

Shih

Lin

Chung

et al. 2000

J. Biomed. Mater. Res.

103

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“…A study published by Baswell et al examined stainless steel wires retrieved from both spine (L-rod instrumentation) and hip (trochanteric reattachment) cases [235]. All wires had fractured (12 breaks for the spinal wires and 4 breaks in the hip wires).…”

Section: Fracture Fixationmentioning

confidence: 98%

Orthopedic Implant Retrieval and Failure Analysis

Jones

Tsao²,

Topoleski

2012

Degradation of Implant Materials

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Orthopedic devices make up a major percentage of the medical devices being implanted today. Success rates exceeding 95% have been reported. However, their longevity is compromised by fatigue, wear, corrosion, and other degradative mechanisms. Adverse biologic responses to products from these different mechanisms can lead to significant bone loss and may even compromise subsequent surgeries. It is imperative that we fully understand what mechanisms are in play and carefully evaluate strategies to minimize, if not eliminate, these degradation processes. Devices retrieved at revision surgery and at autopsy have provided us with important information regarding the performance of orthopedic implants. Surface characterization of the implant, biomechanical analyses, and histological analysis of the tissues surrounding the implant can provide us with information not available through other sources. This chapter will review the significance of retrieved implants to the long-term survival of these implants.

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