For a second straight year, Detroit Lions' starting tailback Kevin Jones has suffered a serious, late-season injury, one that will likely require extensive rehabilitation and probably preclude him from participating in the team's offseason program and possibly training camp. Coach Rod Marinelli confirmed Monday afternoon that Jones tore the anterior cruciate ligament of his right knee late in the first half of Sunday's victory over the Kansas City Chiefs. Team physicians will wait until swelling subsides Marinelli said, before making a determination on whether surgery is needed to repair the ligament. "We'll see how it comes out later this week," Marinelli said. But it is rare that an ACL injury does not require surgery. And if Jones goes under the knife, he faces a rehabilitation stint of 8-10 months.