17 March 2011 Last Updated on 30 March 2011 Paul Spencer-Wimpenny

Anterior Impingement

During the mid range of abduction and adduction a sharp and significant drop is often seen. See below.

This is because the anterior structures are most vulnerable to impingement in this position (in isokinetic terms that is).

shoulder1

In flexion a drop appears at the start of range. See below.

This is because the anterior deltoid locates the gleno humoral joint before lifting it.

This can impinge anterior structures.

shoulder2

However, internal/external rotation will not necessarily show any change. The drops seen are usually as impingement occurs causing reflex inhibition.

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