Gronkowski’s arm broke at the end of the protective plate that was implanted in his arm. Gronkowski sustained the new injury when he went hard to the ground while diving for a pass against the Houston Texans in the first quarter of the Patriots AFC Divisional Playoff game. There will always be a risk to the area at the end of the plate, the source explained, because of a “collection of stress.” The injury could have occurred “three years from now” in the same spot, said the source.