Acromiohumeral interval
Updates to Article Attributes
Body
was changed:
Acromiohumeral interval is a useful and reliable measurement on AP shoulder radiographs and when narrowed is indicative of rotator cuff tear or tendinopathy.
PathologyMeasurement
Measurements of the acromiohumeral interval in the following intervals are suggestive of pathology 1,2:
-
>12 mm:shoulder dislocation; inferior subluxation (e.g. fromjoint effusion) 9-10 mm (range 8-12 mm): normal-
6-7 mm: thinning ofsupraspinatus tendon <6 mm: supraspinatus tear
Radiographic features
The shortest distance is measured.
Plain radiograph
- true AP shoulder radiograph
- measure from the cortical bone at the inferior aspect of the acromion to the humeral head 3
MRI
- can also be performed on coronal and sagittal oblique T1 MR images
- inferior aspect of the acromion (marked by black line directly above the humeral head) directly inferiorly to the centre of the subchondral cortex of the humeral head 3
Interpretation
Measurements of the acromiohumeral interval in the following intervals are suggestive of pathology 1,2:
- >12 mm: shoulder dislocation; inferior subluxation (e.g. from joint effusion)
- 9-10 mm (range 8-12 mm): normal
- 6-7 mm: thinning of supraspinatus tendon
- <6 mm: supraspinatus tear
See also
-<p><strong>Acromiohumeral interval</strong> is a useful and reliable measurement on AP shoulder radiographs and when narrowed is indicative of <a href="/articles/rotator-cuff-tear">rotator cuff tear</a> or tendinopathy. </p><h4>Pathology</h4><p>Measurements of the acromiohumeral interval in the following intervals are suggestive of pathology <sup>1,2</sup>:</p><ul>-<li>>12 mm: <a href="/articles/shoulder-dislocation">shoulder dislocation</a>; inferior subluxation (e.g. from <a href="/articles/joint-effusion">joint effusion</a>)</li>-<li>9-10 mm (range 8-12 mm): normal</li>-<li>6-7 mm: thinning of <a href="/articles/supraspinatus-muscle-and-tendon">supraspinatus tendon</a>-</li>-<li><6 mm: supraspinatus tear</li>-</ul><h4>Radiographic features</h4><p>The shortest distance is measured. </p><h5>Plain radiograph</h5><ul>- +<p><strong>Acromiohumeral interval</strong> is a useful and reliable measurement on AP shoulder radiographs and when narrowed is indicative of <a href="/articles/rotator-cuff-tear">rotator cuff tear</a> or tendinopathy. </p><h4>Measurement</h4><p><span style="font-size:13px">The shortest distance is measured. </span></p><h5>Plain radiograph</h5><ul>
- +</ul><h4>Interpretation</h4><p>Measurements of the acromiohumeral interval in the following intervals are suggestive of pathology <sup>1,2</sup>:</p><ul>
- +<li>>12 mm: <a href="/articles/shoulder-dislocation">shoulder dislocation</a>; inferior subluxation (e.g. from <a href="/articles/joint-effusion">joint effusion</a>)</li>
- +<li>9-10 mm (range 8-12 mm): normal</li>
- +<li>6-7 mm: thinning of <a href="/articles/supraspinatus-muscle-1">supraspinatus tendon</a>
- +</li>
- +<li><6 mm: supraspinatus tear</li>
Unable to process the form. Check for errors and try again.