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What does ER stand for?

ER stands for External Rotation

This definition appears very frequently

See other definitions of ER

Other Resources:
We have 64 other meanings of ER in our Acronym Attic

Samples in periodicals archive:

To assess which is responsible for the greater internal knee rotation during landing in females--namely, increased knee internal moment or decreased external rotation muscle activity--we compared kinematic, kinetic, and electromyographic characteristics between males and females.