Williams suffered a fractured left fibula (near his ankle) and major ligament damage on a then-legal cut block from Seattle guard J.R. Sweezy. Williams still can't watch the play in which he was hurt. He has seen the beginning of the play and then he turns his head.
"My leg was dangling," Williams said.
Williams had four surgeries from September to February. He is working out and hopes he will be ready to practice when training camp starts in seven weeks.
"That's the goal. It's attainable," Williams said. "I want to make sure I'm close to 100 (percent) because my position is very different than others. ... It feels good, just a little weak. That comes with having surgery. But it feels better every day, every week, every month."
Once he is healthy Williams is expected to be part of the defensive tackle rotation. The former undrafted free agent from Notre Dame has excited the 49ers because of his ability to take on double teams and his relentless work ethic.
Williams will need every bit of that work ethic as he battles back from four recent surgeries.