You have to be careful to understand he is not comparing his new highly cross linked poly-on-metal resurfacing device to current metal-on-metal resurfacing devices.
He is comparing it to the previous versions of poly-on-metal resurfacing and total hip replacements.
For the segment who can't get MOM, don't want MOM, or don't need MOM, this polyethylene on metal device now last much longer than it used to.
But the fact is this device still has the same issue all poly on metal devices have, it has a known lifespan because the body cannot get rid of the poly wear particles. But it will last longer now.
If you are young and participate in high impact activities, you still will be looking at MOM for durability and longevity.
Lets say you are 55 years or older and fairly active, now either device might be the only one you ever need so why not go with the poly on metal.
But, if you are 45 or younger, you are going to out live the poly device. MOM is not going to wear out.
Of course, the MOM devices could start failing for some other unknown reasons but they haven't yet after 20 years in service.
Chuckm