[The radiographic diagnosis of posterior dislocation of the shoulder (author's transl)].

In spite of its clinical features, the diagnosis of posterior dislocation of the shoulder is often missed. The authors considered that this is due to an inadequate analysis of the x-rays. They show that the diagnosis can be made on an antero-posterior x-ray and describe the findings in fourteen cases. They note a modification of the gleno-humera line and the features of the associated impaction fracture. A lateral view is necessary to make the diagnosis certain, an axillary view being preferred to a trans-thoracic late-femoral head or of the posterior glenoid margin.