Hip replacements could cause serious problems

Penny Brown, a former gymnast and skier, faced severe issues with her metal-on-metal hip joint, which wore out after eight years, causing pain and job loss. The medical community has issued warnings about such implants, which have a higher failure rate, especially in large joints. Despite some models being withdrawn, others remain in use. Penny expresses frustration over inadequate testing and the ethical implications of widespread use. The medical regulator notes that problems became evident only after extensive use.

What ethical concerns does Penny express regarding the testing of hip implants?

What was the response of the medical regulator regarding the problems with the implants?