PMC7285250_01
Injury of the anterior interosseous nerve with difficulty in performing the "OK" sign (black arrow).
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fig1
However, she presented a deficit attempting the "OK" sign and a positive digit abduction/adduction test, which characterizes an injury to the anterior interosseous nerve (branch of the median nerve) (Figure 1) and ulnar nerve, respectively.
Anteroposterior (AP) radiographic view of the right shoulder shows a humeral head out of the glenoid fossa lying inferior to the glenoid rim (a). Postreduction AP radiographic view shows congruent reduction (b).
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fig2
Radiographic examination confirmed the clinical diagnosis of a complete inferior dislocation of the humeral head lying beneath the glenoid cavity, without any accompanying fracture (Figure 2(a)). An audible pop was heard when the humeral head was reduced (Figure 2(b)).
A transverse (a) T2-weighted MRI view shows a Bankart lesion (white arrow) of the right shoulder. A coronal (b) T2-weighted MRI view shows a bone marrow contusion line associated with a contusion-crack fracture without displacement of the greater tuberosity of the humerus (white arrow) and a complete rupture of the supraspinatus tendon (white circle).
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fig3
A complete rupture of the supraspinatus tendon was also revealed (Figure 3).