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An acromioclavicular separation (AS), or shoulder separation, is when your shoulder and collarbone move or come apart. An AS is usually caused by an injury, such as falling on your shoulder. The bones move or come apart because the ligaments that hold the bones in place are stretched or torn.
Your healthcare provider can usually diagnose an AS because of the abnormal shape of your shoulder. You may also need x-rays to show the separation.
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