Artificial replacement joints are well known for their tendency to fail and to require replacement after a number of years. Artificial spinal discs particularly suffer from the fact that replacing them is unusually difficult, so developing a material that can withstand decades of use has been a major research goal. Some years ago diamond-like carbon (DLC) was a promising coating for joint implants, but it failed spectacularly as it eventually chipped off from the implants and caused all sorts of problems.
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