Smith was diving to make a tackle following a turnover when the left-front portion of his helmet struck the right thigh of safety Abram Elam. Smith is now being removed from the field on a cart, immobilized on a stretcher. He acknowledged fans by lifting his hands as the cart left the field.
Fox sideline reporter Jennifer Hale said medical personnel removed Smith's facemask.
Details to come.
The Rams trail the Dallas Cowboys 7-0.