If a dislocated shoulder has spontaneously reduced before your arrival the only way to confirm the injury is by noting: (a) distal circulation.(b) the patient history. (c) bruising to the shoulder.(d) the presence of deformity.

The patient history.

Explanation:

The dislocated shoulder as be defined as the injury in which the bone upper arms pops out from the shoulder blade. The shoulder joint is the most mobile joint of the body.

The dislocated shoulder may also reduced spontaneously before arriving of the doctor. The injury of the shoulder can be confirmed by looking at the patient's history.

Thus, the correct answer is option (B).

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