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  1. Copilot Answer
    Y radiograph of the left shoulder taken 3 weeks after initial injury showing the dislocated acromioclavicular joint.
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    A hairline fracture is a non-displaced bone fracture that is barely visible on an X-ray. The following signs may indicate a hairline fracture:
    • A crack or jagged edge on the bone.
    • Floating bone segments visible on an X-ray.
    • Skin over the break might look like a tent when gently pinched.
    • A bump on or near the shoulder.
    • A grinding or crackling sound when moving the shoulder.
    • Stiffness or inability to move the shoulder.
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