Peter Attia· MD
there have been times where people have even had surgery on their knee because of knee pain even though the problem was the hip and that's because if you have someone let's say has arthritis of the knee and arthritis of the hip and they complain of knee pain they get an injection inside the knee because they have arthritis it doesn't work doesn't work cuz the problems really in the hip they get a knee replacement they still have the exact same pain until someone figures out that it's coming coming from the hip