In agreement with some of what was described in previous posts, if the manufacturer is not the one claiming that the TJA total joint arthroplasty can be used while performing high intensity or extreme sports then it would not fall within the manufacturer responsibility to retest their device (actually they may have legal rights to sue the hospital for false advertising their product!). One step the manufacturer could take knowing that their product is being misused, I believe, is to update their labeling information to make it clear that the product is not be used doing extreme sports. In another scenario if the manufacturer was the one advertising the product, then they could be charged with falsely advertising a product. The would need to retest their product in case they want to update their label to indicate it can be used to do extreme sports.