Cost of having it replaced should be covered with some exceptions
What I would expect from a good warranty:
If there were problems due to a defect in the implant, the cost of having it replaced should be covered. Excluded from the warranty would be problems that develop as a result of poorly done surgery or poor fit (the surgeon should make certain the implant fits properly – the manufacturer can not know what the proper fit is. Also, problems arising from bone rejection of the implant would not be covered, unless there are a high number of rejections from that particular implant. In that case, the materials are apparently at fault.
I had a hip replacement last year due to severe osteoarthritis damage, and so far I couldn’t be happier. Although made by Depuy, it is not a metal on metal implant. After 3 years of terrible pain, I have been completely pain free since the surgery, and I have regained mobility in the joint that I had lost. I was told all the precautions and possible problems with getting an implant, and fortunately, so far, I have not encountered any problems. I was told the expected useful life of the implant was 20 years, but beyond the 20 years there is only a 5% failure rate for each additional year. I am currently 62 years old.