I agree time is a key factor here on the island... We do know that the others have detailed files on the Losties.... Juliet was even able to tell Jack that Sarah was happy with her new life! They know the first and last name of the losties... So I guess it isn't that big of a shock for me that they know he was paralized.

That doesn't change the fact I think that there is a big factor on how time is moving or not moving on the island...

__________________
Please don't give up, Des. Because all we really need to survive is one person who truly loves us. And you have her. I will wait for
you. Always. I love you, Pen

DESMOND: I love you, Penny. I've always loved you. I'm so sorry. I love you!
PENNY: I love you too.
DESMOND: I don't know where I am, but--
PENNY: I'll find you, Des--
DESMOND: --I promise--
PENNY: --no matter what--
DESMOND: --I'll come back to you--
PENNY: --I won't give up--
BOTH: I promise. I love you.