Acromiohumeral interval
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- updated 12 Dec 2022:
- Integral Diagnostics, Shareholder (ongoing)
- Micro-X Ltd, Shareholder (ongoing)
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 subacromial impingement, rotator cuff tear orand/or tendinopathy. In patients with rotator cuff repair, a narrow acromiohumeral interval is a risk factor for re-tear 7.
Measurement
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/subacromial-impingement">subacromial impingement</a>, <a href="/articles/rotator-cuff-tear">rotator cuff tear</a> or tendinopathy. </p><h4>Measurement</h4><p>The shortest distance is measured. </p><h5>Plain radiograph</h5><ul>-<li>true AP shoulder radiograph</li>-<li>measure from the cortical bone at the inferior aspect of the acromion to the humeral head <sup>3</sup>-</li>-</ul><h5>MRI</h5><ul>-<li>can also be performed on coronal and sagittal oblique T1 MR images</li>-<li>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 <sup>3</sup>-</li>-</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>-</ul><h4>See also</h4><ul>-<li><a href="/articles/high-riding-shoulder">superior humeral head subluxation</a></li>-<li><a href="/articles/normal-radiographic-measurements-of-the-shoulder-1">normal radiographic measurements of the shoulder</a></li>- +<p><strong>Acromiohumeral interval</strong> is a useful and reliable measurement on AP shoulder radiographs and when narrowed is indicative of <a href="/articles/subacromial-impingement">subacromial impingement</a>, <a href="/articles/rotator-cuff-tear">rotator cuff tear</a> and/or tendinopathy. In patients with <a href="/articles/rotator-cuff-repair" title="rotator cuff repair">rotator cuff repair</a>, a narrow acromiohumeral interval is a risk factor for re-tear <sup>7</sup>. </p><h4>Measurement</h4><p>The shortest distance is measured. </p><h5>Plain radiograph</h5><ul>
- +<li><p>true AP shoulder radiograph</p></li>
- +<li><p>measure from the cortical bone at the inferior aspect of the acromion to the humeral head <sup>3</sup></p></li>
- +</ul><h5>MRI</h5><ul>
- +<li><p>can also be performed on coronal and sagittal oblique T1 MR images</p></li>
- +<li><p>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 <sup>3</sup></p></li>
- +</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><p>>12 mm: <a href="/articles/shoulder-dislocation">shoulder dislocation</a>; inferior subluxation (e.g. from <a href="/articles/joint-effusion">joint effusion</a>)</p></li>
- +<li><p>9-10 mm (range 8-12 mm): normal</p></li>
- +<li><p>6-7 mm: thinning of <a href="/articles/supraspinatus-muscle-1">supraspinatus tendon</a></p></li>
- +<li><p><6 mm: supraspinatus tear</p></li>
- +</ul><h4>See also</h4><ul>
- +<li><p><a href="/articles/high-riding-shoulder">superior humeral head subluxation</a></p></li>
- +<li><p><a href="/articles/normal-radiographic-measurements-of-the-shoulder-1">normal radiographic measurements of the shoulder</a></p></li>
References changed:
- 7. Zhao J, Luo M, Pan J et al. Risk Factors Affecting Rotator Cuff Retear After Arthroscopic Repair: A Meta-Analysis and Systematic Review. J Shoulder Elbow Surg. 2021;30(11):2660-70. <a href="https://doi.org/10.1016/j.jse.2021.05.010">doi:10.1016/j.jse.2021.05.010</a> - <a href="https://www.ncbi.nlm.nih.gov/pubmed/34089878">Pubmed</a>
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