While browsing Netflix, I learned about advances in medical equipment.
To my disbelief, over the years hip replacements have been a major problem. What's most important about hip replacement equipment? 
The materials that are used. 
The problem today with hip replacement equipment is that it can easily be marketed  with little testing or checking. 
Most medical equipment has to go through PMA (Pre-Market Approval).
Hip replacement equipment can be approved in smaller studies without extra data to prove it is equivalent to prior equipment.
This is called a "Daisy Chain." 
Does anyone really investigate what's being placed inside their bodies? 
I'll bet not. 
People began to experience symptoms of heart failure, visual impairment, skin rashes, noise coming from their hip and neuropsychiatric problems. 
Chrome Cobalt is to blame for metal poisoning. 
Surgeons and doctors recommend for metal on metal hip replacements to undergo blood and chromium testing to check for poisoning. 
If you or a loved one has had hip replacement surgery or contemplates it, keep in mind the impact it may have. Find more research at: https://medlineplus.gov/ency/article/002495.htm. https://www.fda.gov/medicaldevices .