Explant analysis of a chromium nitride coated metal-on-metal total wrist replacement: A case study

IF 1.7 4区 医学 Q3 ENGINEERING, BIOMEDICAL
Thomas J Joyce, Göksu Kandemir, Duncan McGuire, Michael Solomons, Daniel J Brown
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引用次数: 0

Abstract

Explant analysis can provide important understanding of how artificial joints perform in the human body. The articulating surfaces of the metacarpal head and the radius cup from a chromium nitride coated metal-on-metal Motec wrist implant were analysed. Due to bone resorption and aseptic loosening, the implant was removed after 6 years in the patient, and metallosis was observed during removal. Visually, some areas of the articulating surfaces appeared polished, others were dulled. A chemical composition analysis of the metacarpal head showed that the polished surfaces were chromium rich, implying this surface was the original chromium nitride coating, whereas the dulled surfaces were cobalt rich, indicating the underlying cobalt chromium substrate. In addition, the underlying cobalt chromium substrate was an order of magnitude rougher than the polished surface, indicating the scale of damage to it. It is speculated that the loss of the coating, and the subsequent damage to the underlying substrate due to a third-body wear process, led to osteolysis and the metallosis seen at revision surgery.
氮化铬涂层金属全腕关节置换术的切口分析:病例研究
爆破分析可以帮助人们了解人工关节在人体中的性能。我们对氮化铬涂层金属对金属 Motec 腕关节植入体的掌骨头和桡骨杯的关节面进行了分析。由于骨吸收和无菌性松动,患者在植入 6 年后将植入体取出,并在取出过程中观察到金属化现象。从外观上看,关节表面的一些区域呈抛光状,而另一些区域则黯淡无光。对掌骨头进行的化学成分分析表明,抛光表面富含铬,这意味着该表面是原始的氮化铬涂层,而变暗的表面富含钴,这表明底层是钴铬基质。此外,底层的钴铬基底比抛光表面粗糙一个数量级,表明其受损程度。据推测,涂层的脱落以及随后由于第三体磨损过程造成的底层基底的损坏导致了骨溶解和翻修手术中出现的金属病变。
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来源期刊
CiteScore
3.60
自引率
5.60%
发文量
122
审稿时长
6 months
期刊介绍: The Journal of Engineering in Medicine is an interdisciplinary journal encompassing all aspects of engineering in medicine. The Journal is a vital tool for maintaining an understanding of the newest techniques and research in medical engineering.
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