The chemical, originally a poison, but now more well known for smoothing celebrities' wrinkles, can be used to relax the affected muscle in the arm. Tennis elbow is caused by a lack of oxygen in the affected muscle, and by forcing the muscle to relax, the flow of blood through the muscle increases, meaning more oxygen for the tissue.
"This method really helps a vulnerable group", surgeon Kurt Pettersson told Swedish Television news in Örebro.
The doctors there are the first in the world to test the method. Up to three percent of the population is hit by the condition in Sweden each year.