Figure 1. A) Anteroposterior; B) Lateral plain radiograph of the patient’s right wrist demonstrating no pathology; C) Transversal U/S scan at the level of ECU tendon’s groove with the forearm in pronation. The ECU tendon is lying in its groove (normal position); D) With the forearm in supination the ECU tendon is dislocated volarly, at the ulnar side of its groove.