Jones-Drew, who had a procedure to repair a damaged meniscus in January, said in an interview on SiriusXM radio in April that he's already able to run on the knee, which is something that wasn't initially expected to happen until May. He played the entire season with a torn meniscus in his left knee.
The condition of Jones-Drew's knee deteriorated during the course of the season, and it needed to be drained the night before a key Week 14 matchup at Indianapolis.
After that loss, Jones-Drew had to shut it down for the final two games. Even so, he rushed for 1,324 yards and five touchdowns and caught 34 passes for two more TDs en route to being selected to his second Pro Bowl.
Kampman tore the anterior cruciate ligament in his right knee during a non-contact drill on Nov. 11 and was placed on season-ending injured reserve two days later.
The Associated Press contributed to this report.