I was just speculating on what word you might have used earlier in this context that had an alternate meaning that would be replaced by the filter. I couldn't think of one.
Vilma's condition was diagnosed in High School. He played 10 years in the NFL plus college.
http://www.nydailynews.com/sports/f...onathan-vilma-knee-injury-04-article-1.259485 In high school, Vilma was diagnosed with osteochondritis dissecans (OCD), a bone defect that can cause instability and loose particles in the joint. Although Vilma and the team have refused to specify his injury, his right knee does contain loose fragments, it was confirmed.
Just read that old article, and you are correct. I can't find any details of the 2007 procedure -- wonder if he had microfracture or simple arthroplasty.