According to Bryan Strickland of the team's official website, Williams was diagnosed with a torn MCL and dislocated his right patella. There is no timetable for his return.
"I just remember my foot getting stuck in the ground and kind of buckling," Williams told Strickland. "I feel way better than when I did it, and I'm definitely in good spirits. God has a plan, and it could have been worse."
Joseph Person of the Charlotte Observer tweeted out a photo of the scene:
Taylor Moton, a 2017 second-round pick, replaced Williams at right tackle, per Person.
Since being drafted out of Oklahoma in the fourth round in 2015, Williams has increasingly become a key part of Carolina's offensive line. He started 10-plus games in each of the past two seasons, including all 16 regular-season contests last year.
The 25-year-old received second-team All-Pro honors in 2017, so his absence will leave a major hole on the right side of Carolina's offensive line.