Posterior glenohumeral dislocation in a 51-year-old man with shoulder pain and the humeral head fixed in internal rotation. (A) Anteroposterior radiograph.

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Posterior glenohumeral dislocation in a 51-year-old man with shoulder pain and the humeral head fixed in internal rotation. (A) Anteroposterior radiograph of the shoulder shows the trough line sign (white arrows), representing the margin of an impaction fracture of the anteromedial aspect of the humeral head (reverse Hill-Sachs fracture). Note that the glenohumeral alignment is near-normal on the anteroposterior radiograph. (B) Axillary view shows posterior translation of the humeral head in relation to the glenoid fossa. Note the impaction fracture of the anteromedial aspect of the humeral head (reverse Hill-Sachs fracture, white arrow). (C) Axial T1-weighted, fat-suppressed MR arthrogram after reduction shows the large reverse Hill-Sachs fracture (white arrow). The posterior labrum (not shown) was completely disrupted (reverse Bankart lesion). Note the intra-articular fragment (black arrow). Source: Musculoskeletal, Introduction to Diagnostic Radiology Citation: Elsayes KM, Oldham SA. Introduction to Diagnostic Radiology; 2015 Available at: https://accessmedicine.mhmedical.com/DownloadImage.aspx?image=/data/books/1562/elsayes_ch07_fig-c21-02.png&sec=95879007&BookID=1562&ChapterSecID=95878512&imagename= Accessed: October 25, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved

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