Weakness of the serratus anterior muscle can cause destabilization of the scapula and will therefore affect all proximal upper limb muscles due to their.

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Presentation transcript:

Weakness of the serratus anterior muscle can cause destabilization of the scapula and will therefore affect all proximal upper limb muscles due to their scapular attachment. Muscle testing may reveal weakness of shoulder or elbow flexion due to weakness of the serratus muscle. During applied extension force at either the elbow or shoulder, the scapula is rotated downward in the sagittal plane or derotated. This may produce quasi-weakness of the tested muscle due to a “destabilizing effect.” Source: Kinesiology, CURRENT Diagnosis & Treatment: Physical Medicine & Rehabilitation Citation: Maitin IB, Cruz E. CURRENT Diagnosis & Treatment: Physical Medicine & Rehabilitation; 2015 Available at: http://accessmedicine.mhmedical.com/DownloadImage.aspx?image=/data/books/1180/mai_ch4_f008.png&sec=70376278&BookID=1180&ChapterSecID=70376230&imagename= Accessed: October 24, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved