"Very, very underrated," Arians said. "He's as solid a center as I've been around in a long time."
After signing as undrafted free agent in 2007, Sendlein was just hoping for a career as a practice squad player but earned a spot on the 53-man roster when Al Johnson went down in the season opener on "Monday Night Football" against San Francisco. Sendlein was inserted into the lineup, played in 12 games that season and basically hasn't left.
According to ESPN Stats & Information, the Cardinals have employed 27 other offensive linemen since 2007. The most stable portion of Sendlein's career was his first few years in the league. According to the Cardinals' media guide, the usual starting offensive line was the same from 2007 to 2009, with the exception of one change.
http://espn.go.com/blog/arizona-cardinals/post/_/id/8249/stability-defines-lyle-sendleins-career