external rotation

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external rotation

Lateral rotation Biomechanics The act of turning about an axis passing through the center of the leg; ER of the leg occurs with closed chain supination; the talus acts as an extension of the leg in frontal and transverse planes
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.

ex·ter·nal ro·ta·tion

(eks-tĕr'năl rō-tā'shŭn)
Movement of a joint, around its long axis, away from the midline of the body.
Synonym(s): lateral rotation.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
References in periodicals archive ?
These two muscles laterally rotate and abduct the hip and are important to help stabilize the hip.
The gluteals (maximus, medius, and minimus) and the "deep six" muscles of the hip (piriformis, quadratus femoris, obturator internus, obturator externus, gemellus superior, and gemellus inferior) serve to flex, extend, abduct, adduct, and medially or laterally rotate the hip.
* Infraspinatus -- extends and laterally rotates the arm.