SANTA CLARA -- Running back Marcus Lattimore underwent an extensive medical examination Thursday at Stanford, and the 49ers liked what their team doctors saw.
"Everything looks good structurally with all the guys that we drafted," 49ers coach Jim Harbaugh said Friday. "The ACL looks really good for Marcus. We have to take a step back in terms of some of the cutting because we want that inside of the knee, the lateral side of the knee, to heal fully."
Lattimore, once a potential first-round draft draft pick, sustained a grisly injury to his right leg in October that dislocated his knee and tore three ligaments. The 49ers selected the South Carolina running back in the fourth round with the No. 131 overall pick.
The 49ers want to be cautious with Lattimore's rehab, so they are not rushing to get him on the field. He has not been cleared for any on-field work. He is expected to open training camp on the non-football injury list (because the injury did not occur while with an NFL team). The 49ers are prepared for him to sit out the 2013 season, if that's what the medical staff determines is in the best interest of Lattimore and the team.
"I think that would be fine," said Lattimore, who is taking part in meetings at the 49ers rookie camp. "Whatever happens these next three months probably will determine that. I'm going to continue to keep working hard, and if I'm called upon, I feel like hopefully I'll be ready.
"I feel like whatever's best, I'm going to go with that. We have a lot of great guys on our team -- Kendall (Hunter), Frank (Gore), Anthony Dixon, LaMichael (James). And I know I can learn a lot from those guys."