Why Have Twelve Changes Been Made in the Osasuna - Atlético? This Is the Rule that Explains It

The regulation is clear in cases where there may be shocks such as that of Pablo Barrios

"The medical tests performed on Pablo Barrios rule out any serious injury after being replaced this Thursday at the beginning of the second part of Osasuna-Atleti after accidentally colliding his head with Marcos Llorente's hip....