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Causes
By Mayo Clinic staff
The top of your shoulder blade (acromion) meets the end of your collarbone (clavicle) at the acromioclavicular (AC) joint. A separated shoulder is a stretch or tear of one or more of the ligaments of the acromioclavicular joint.
The most common cause of a separated shoulder is a blow to your shoulder or a fall directly on your shoulder. The fall may stretch or tear the ligaments that stabilize the acromioclavicular joint. This separates the bones in the shoulder, creating a bump at the top of the shoulder.
- Shoulder separation. American Academy of Orthopaedic Surgeons. http://orthoinfo.aaos.org/topic.cfm?topic=A00033. Accessed Nov. 12, 2008.
- Shoulder problems. American Academy of Family Physicians. http://familydoctor.org/online/famdocen/home/tools/symptom/518.html. Accessed Nov. 12, 2008.
- Koehler SM. Acromioclavicular joint injury (shoulder separation). http://www.uptodate.com/home/index.html. Accessed Nov. 12, 2008.
- McMahon PJ, et al. Sports Medicine: Acromioclavicular joint injury. In: Skinner HB. Current Diagnosis & Treatment in Orthopedics. 4th ed. The McGraw-Hill Companies; 2006. http://www.accessmedicine.com/content.aspx?aID=2319233. Accessed Jan. 12, 2009.
- Gutman D, et al. Extremity Trauma: Acromioclavicular Joint Separation. In: Knoop KJ, et al. Atlas of Emergency Medicine. 2nd ed. The McGraw-Hill Companies; 2002. http://www.accessmedicine.com/content.aspx?aID=784421&searchStr=dislocation+of+acromioclavicular+joint. Accessed Jan. 12, 2009.
