Terrell Davis tells TMZ Sports he's concerned Todd Gurley might never regain his old form in Atlanta ... saying a similar knee issue in 1999 caused him to lose a permanent step.
"I was never the same," the Denver Broncos legend says.
Gurley tore his ACL in college at Georgia in 2014 ... but didn't have problems with the surgically repaired knee up until 2019 -- when the Rams RB dealt with arthritis.
Gurley was still able to run on it, but he clearly wasn't the same guy .