This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Orthopaedics
Which is true regarding shoulder dislocation - 
Select and explain. 
A. Posterior dislocation is often over-looked, B. Pain is severe in anterior dislocation, C. Radiography may be misleading in posterior dislocation, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: The features of posterior dislocation of the shoulder are not very striking, and for that reason the injury is often overlooked. An important sign is fixed medial (internal) rotation of the arm, which cannot be rotated outward (externally), even to neutral position.
Radiography may be misleading if only the ordinary anteroposterior film is available, because the dislocation may not be apparent or at least not obvious on this projection.