Clinton Portis' Knees

[SC Skins Fan]

So I have been mildly concerned about Portis' tendonitis, but not too worried. I was talking to a guy today, though, and he was arguing that tendonitis is more serious than I had thought and that this injury will most likely linger and cause Clinton problems all year. I have tried finding more information on tendonitis and how that injury has affected guys in the past but I can't find much. Are there any orthepedists who could provide me with some solid information on how big a problem tendonitis is and whether Portis will likely face problems stemming from this injury all year? Can anyone think of another instance where a running back has had problems with tendonitis and how that has affected them? I believe Marshall Faulk said on NFL Network that he dealt with tendonitis in his second year and I can see that he did not miss any games that season. Any information is much appreciated.