9. What is the expected life for the resurfacing hip as compared to THR?

WE DON’T KNOW!
It is only one of the possibilities to do longer than 10 years in young and active people! If you don’t get osteolysis (bone that is going away) or no measurable wear of the friction couple, metal-on-metal resurfacing can last very long. Just give me a crystal bal. There are large metal-on-metal articulations that stayed for more then 30 years. If activity will play a big part in the wear of the prosthesis, is today also questionable.