I-Test
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ANSWER
From the question on page 173.
Posterior shoulder dislocation.
Anteroposterior right shoulder Several findings compatible with a posterior shoulder dislocation are present (fig 1). The humeral head is fixed in internal rotation, producing a "light-bulb" appearance and there is increased distance between the anterior glenoid rim and the medial aspect of the humeral head. The posterior humeral head is impacted onto the posterior rim of the glenoid (ellipse). A tiny fracture fragment is also seen overlying the axillary recess (arrow).
Figure 1 Anteroposterior radiograph of the right shoulder, with abnormal overlap of the posterior humeral head and posterior glenoid rim (black ellipse) and a loose fracture fragment (arrow).
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Transscapular view This view shows posterior dislocation of the humeral head relative to the glenoid. The humeral head should overlap the glenoid fossa (ellipse) on this view (fig 2).
Figure 2 Transscapular radiograph of the right shoulde, showing glenoid rim (ellipse) with the humeral head | |||||||||
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