Doctor: Palmer knee injury 'potentially career-ending': Carson Palmer's went down on his first pass in a playoff game in what could potentially be his last game. This quote is from the doctor who helped work on Palmer "On a scale of one to three, it was a four," he said. "It was off the chart. It was pretty badly damaged -- shredded is the better term." This is horrible news and a tragic situation but Carson is still a young guy and I don't think we've seen the last of him.