Cowan’s injury

Here’s the story I wrote off of the spring game from the Rose Bowl, but an interesting sidelight is whether or not Patrick Cowan did damage to his ACL during Monday’s practice, then practiced Thursday.
The series of events goes like this:
He had arthroscopic surgery on his left knee in February, and injured it Monday in practice.
The next day it was announced an MRI was clean, but he did not practice. Cowan went down again in Thursday’s practice.
Coach Rick Neuheisel said Fridays MRI showed more than what was in there on the Tuesday MRI. He made a comment similar to that twice during conference call, and after the second time he added the Tuesday MRI was fine, normal.
Cowan was asked whether the Tuesday MRI showed a slight tear to his ACL, and would not answer the question. Instead, he said, All I know is its to a point where I need surgery.”