Here goes:
1. November 1, 2008 (Pacers): No key players missed entire game.
2. November 14, 2008 (Nuggets): No key players missed entire game.
3. December 25, 2008 (Lakers): No key players missed entire game (but I remember Perk was banged up -- I think he hurt his shoulder during the game)
4. December 26, 2008 (Warriors): Perk missed the game
5. December 30, 2008 (Blazers): No key players missed entire game.
6. January 4, 2009 (Knicks): No key players missed entire game.
7. January 6, 2009 (Bobcats): No key players missed entire game.
8. January 7, 2009 (Rockets): No key players missed entire game.
9. January 9, 2009 (Cavaliers): No key players missed entire game.
10. February 5, 2009 (Lakers): Brian Scalabrine missed the game.
11. February 8, 2009 (Spurs): Brian Scalabrine missed the game.
12. February 19, 2009 (Jazz): Tony Allen missed the game; KG was injured in this game and missed the second half.
13. February 25, 2009 (Clippers): Kevin Garnett, Tony Allen, Brian Scalabrine missed the game.
14. March 1, 2009 (Pistons): Kevin Garnett, Tony Allen, Brian Scalabrine missed the game.
15. March 8, 2009 (Magic): Kevin Garnett, Rajon Rondo, Tony Allen, Brian Scalabrine missed the game.
16. March 11, 2009 (Heat): Kevin Garnett, Rajon Rondo, Glen Davis, Tony Allen, Brian Scalabrine missed the game.
17. March 15, 2009 (Bucks): Kevin Garnett, Glen Davis, Tony Allen, Brian Scalabrine missed the game.
18. March 17, 2009 (Bulls): Kevin Garnett, Glen Davis, Tony Allen, Brian Scalabrine missed the game; Leon Powe got injured.
19. March 25, 2009 (Magic): Kevin Garnett, Leon Powe, Tony Allen, Brian Scalabrine missed the game.
There may be some in-game injuries that I overlooked, and it's always good to fact check lists like this. Thank God for lunch breaks, huh?