Defensive end Jason Jones was carted off the field during the second quarter of his third game with the Lions. (Mark Cunningham/Getty Images)
Detroit Lions defensive end Jason Jones tore the patellar tendon in his left knee during Sunday's win over the Redskins and is out for the rest of the season, according to multiple reports.
Jones was carted off the field midway through the second quarter. It was just his third game in a Lions uniform, after signing a three-year, $9.5-million free-agent contract during the offseason.
Fox Sports 1's Alex Marvez first reported the news.
Detroit brought in Jones, a former Tennessee Titan and Seattle Seahawk, to start opposite first-round draft pick Ezekiel Ansah and replace departed linemen Kyle Vanden Bosch and Clint Avril.
He entered the season with 18.5 career sacks, including a career-high five during his rookie 2008 season, which he played under then-Titans defensive coordinator and current Lions head coach Jim Schwartz.
Ten-year veteran Israel Idonije, signed as a free agent after a long stint with the Bears, 2010 seventh-round draft pick Willie Young, and 2013 fourth-round pick Devin Taylor are listed as the team's backup defensive ends.