While it is fact that he suffered from a left knee injury. I think it's become a myth to say the injury is the reason he's not very good at RT. CK was a young, raw talent coming out, and, in general, he was not very good his first two years--regardless of which side he played. For example, in year 2 he couldn't beat out Henderson or Mills at RT.
CK himself said he's simply more comfortable on the left side because that's where he's played his entire football life. It would be good to see him practice at RT through the year, but his hip injury screwed that possibility.