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The hip resurfacing devices are metal-on-metal articulating devices which differ from total hip replacement devices because they are more bone conserving and retain the natural geometry (so-called large ball THR devices share this trait).
The analysis of 402,051 hip replacements showed that 6.2% of metal-on-metal hip implants had failed within five years, compared to 1.7% of metal-on-plastic and 2.3% of ceramic-on-ceramic hip implants. Each 1 mm (0.039 in) increase in head size of metal-on-metal hip implants was associated with a 2% increase in failure rate.
The 2010 DePuy Hip Replacement Recall was instituted when DePuy Orthopaedics, Inc., a division of Johnson and Johnson, recalled its ASR XL Acetabular metal-on-metal hip replacement system on August 24, 2010. [1] [2]
Metallosis is the medical condition involving deposition and build-up of metal debris in the soft tissues of the body. Metallosis has been known to occur when metallic components in medical implants, specifically joint replacements, abrade against one another.
Although hip resurfacing has been around for some 40 years, the contemporary metal on metal bearing hip resurfacing has only increased in popularity amongst surgeons and patients in the past decade. Health-related quality of life measures were markedly improved and patient satisfaction was favorable after hip resurfacing arthroplasty. [11]
McMinn is currently under police investigation for allegedly keeping the body parts of thousands of patients over a 25-year period. [1] McMinn developed one of the successful modern metal-on-metal hip resurfacing [2] and the instrumentation and surgical technique to implant it.
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Vitallium is an alloy of 65% cobalt, 30% chromium, 5% molybdenum, and other substances. The alloy is used in dentistry and artificial joints, because of its resistance to corrosion. It is also used for components of turbochargers because of its thermal resistance. [citation needed]
A metal implant is placed within the femur, and a ceramic ball is attached to it. When these parts are put together, the ball fits into the plastic liner inside the socket.
Commonly implanted metals. A variety of minimally bioreactive metals are routinely implanted. The most commonly implanted form of stainless steel is 316L. Cobalt - chromium and titanium -based implant alloys are also permanently implanted. All of these are made passive by a thin layer of oxide on their surface.