I am just curious why some surgeons say marathoners must never run marathons again while others say its OK? Is it the quality of the implant or just the confidence of the surgeon’s abilities. I belong to Kaiser Permanente and my surgeon used the zimmer ML taper stem, zimmer TM cup and ceramic head . This was back in 2015 and I don’t know if maybe that implant is inferior in quality to others? Shouldn’t all implants (since I assume the technology is the same) have the same level of durability?