Rashard Mendenhall sidelined because of right knee

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Early in Saturday’s preseason game vs. San Diego, Cardinals running back Rashard Mendenhall showed an ability to bounce runs outside and to use his good speed to quickly pick up yardage.

However, Mendenhall was sidelined in the first half because of his right knee, and it’s questionable whether he’ll see any more work against the Chargers, according to Darren Urban of AzCardinals.com.

The degree of the injury is unknown, but Mendenhall was seen “walking around,” Urban said.

The 26-year-old Mendenhall, who joined the Cardinals in March after five seasons with the Steelers, racked up 47 yards on just six carries in the first quarter against the Chargers.

Mendenhall has dealt with tendonitis in his right knee during training camp. He suffered an ACL tear in his right knee in the 2011 regular-season finale with Pittsburgh.

Mendenhall has had some bad injury luck in his NFL career. He missed most of his rookie season of 2008 after suffering a shoulder injury. Then, after three seasons of largely good health, he tore his right ACL. In 2012, Mendenhall was limited to just six games, and he missed time with an Achilles injury.