The question (“what set of conditions actually cause a person to get a hip replacement surgery apart from an accident?”) wasn’t about her case. The article clearly indicates she had an accident (“Twenty years before, she had a hip replacement that stemmed from an injury she sustained in a car crash ten years before that”)
Comments
Age. Hip replacement surgery is common among the elderly.
She had a hip replacement at age 37. That's not due to age.
The question (“what set of conditions actually cause a person to get a hip replacement surgery apart from an accident?”) wasn’t about her case. The article clearly indicates she had an accident (“Twenty years before, she had a hip replacement that stemmed from an injury she sustained in a car crash ten years before that”)