Alison King reportedly injured a co-star while enacting a fight scene.
The Coronation Street actress, who plays Carla Connor, sprained Robert Beck's thumb as they fell off a table, reports the Sunday Mirror.
Filming was halted so that Beck, who acts as murderer Jimmy Dockerson, could get his thumb medically treated.
A source said: "It just goes to show how seriously Coronation stars take their work.
"Alison and Rob were determined to get the scene just right so they kept going until the director had exactly what he needed.
"No one was badly hurt and filming will restart next week."