Damn.  Good news is he's expected back for the opener.

http://www.tennessean.com/apps/pbcs.dll/article?AID=/20080814/SPORTS01/80814030/1027

Titans right tackle David Stewart is scheduled for arthroscopic knee surgery on Thursday morning and is expected to miss at least two preseason games.

Stewart injured the knee in the team’s preseason game against the Rams and missed practices earlier in this week. He’s expected to be replaced in the starting lineup for Friday night’s game against the Raiders by fourth-year player Daniel Loper