external rotation

(redirected from External rotator)

external rotation

turning outwardly or away from the midline of the body, such as when a leg is externally rotated with the toes turned outward or away from the body's midline.

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

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.
Figure 1: The sites of the main nerve centres and descending pathways in the brain and spinal cord that control voluntary movement, represented in diagrammatic sections.

external rotation

a movement at a joint that causes rotation of a limb or part of a limb around its long axis away from the midline of the body, e.g. external rotation at the elbow turns the forearm outwards, bringing the palm of the hand to face forwards, or the whole arm can be externally rotated at the shoulder; the whole leg can be externally rotated from the hip but the knee does not allow external rotation of the lower leg alone. Opposite of internal rotation. Figure 1.
References in periodicals archive ?
Conclusion: There is significant weakness of the hip abductor and external rotator muscles, but no alteration in lower extremity kinematics in subjects with PFPS.
Focus on the hip adductor, abductor, flexor and external rotator muscles.
The purpose of this study was to investigate the relationship between internal rotation of the knee and muscle activity from internal and external rotator muscles, and between internal rotation of the knee and externally applied loads on the knee during landing in collegiate basketball players.
This opposition allows the external rotator muscles to be actively engaged at the top of the thigh.
Due to the musculature involved in the specific skills, we believe that every baseball player should be exposed to the following exercises: rotary torso, internal rotator cuff, external rotator cuff, posterior deltoid, pullover, and wrist curls.
The dangers are in low back complaints, external rotator tendinitis at the hip, and problems of the patella, foot, and ankle associated with forced pronation (rolling in at the arch).
Shortening of these muscles is one explanation for postsurgical external rotator cuff weakness in patients with a functioning deltoid.
The plot of external rotator moment arms in the results section demonstrates that throughout external rotation, the lateralized humerus design improves the moment arm for the external rotators more than the other design options.
The shoulder block paralyses the external rotators and abductors of the joint, so it rests happily in external rotation in a sling.
Significant emphasis in both preventative conditioning and rehabilitation strength and conditioning programs is placed on the posterior rotator cuff (external rotators) since the external rotators undergo tremendous eccentric contraction and overload during the deceleration phase of the service motion (Ellenbecker et al.
Thus, the posterior augmented baseplate when used with posterior wear achieved the most lateral humeral position in this computer model, resulting in greater muscle tensioning of the internal and external rotators.