This is not someone who should be truly considered the classic "injury proned" player. He has actually had THREE ACL repairs on the same knee........the RIGHT KNEE..........and he is a LEFT-FOOTED PUNTER.
The real story is that he sustained his first ACL tear at Baylor in a freak set of events. This is part of the story that not too many people realize. Shortly after taking home the Ray Guy Award, Daniel partially tore his right ACL in December of 2004 playing basketball. An MRI on the knee was read as "clear". Unaware of the partial ACL tear in his right knee, he played the entire 2005 season. When the NFL scouts came for Baylor Junior Pro Day on April 18, 2006, Daniel ran 2 very good times in the 40 impressing the pro scouts in attendance. Then 2 days later, while home with friends, Daniel hurt his right knee while playing basketball. Choosing to consult another orthopedist, the MRI from 2004 was compared with the new 2006 MRI. It was then that he was told Daniel that the ACL was actually partially torn in December 2004 and the new injury just completed the tear.
He then had the repair performed and pushed (against medical advice) to get back on the field only 4 months after the surgery. That was not long enough to rehab safe muscle strength. He then re-tore his right ACL (which had bothered him ever since he rushed back to play) and missed the 2008 season following that repair.
The last ACL tear occurred December of last year when he got tangled up covering a punt return. He caught his cleats in the artificial turf. He refused to leave the game and said he wanted to help his teammates, which he did by holding on extra points and field goals for the remainder of the game.
This guy is a warrior, and chances are good that he can avoid further injury with just a little more concern directed to himself. His other foot should be able to return to canon status. He would make the Texans proud.