The acromioclavicular (AC) joint is between the upper part of the shoulder blade and the collarbone. AC joint separation happens when the ligaments of this joint become damaged or torn. This causes a separation between the shoulder blade and the collarbone.
AC joint separation is caused by a trauma to the shoulder such as:
Factors that may increase your chance of an AC joint separation include:
Symptoms may include:
You will be asked about your symptoms, medical history, and related accident. A physical exam will be done. It may include range-of-motion tests of the shoulder. The diagnosis can be made when there is an obvious deformity of the joint.
Images may be taken of your shoulder. This can be done with x-rays.
Talk with your doctor about the best treatment plan for you. Treatment depends on the degree of your AC joint separation. Options include:
A support, such as a sling, will be given to prevent the shoulder from moving and reduce pain as it heals. Applying an ice pack will also help reduce swelling and promote proper healing.
Your doctor may also advise over-the-counter or prescription pain medication.
Surgery may be needed if the AC joint separation is severe. Surgical options include:
To help reduce your chance of AC joint separation:
To help reduce falling hazards at work and home:
Ortho Info— American Academy of Orthopaedic Surgeons
Sports Med—American Orthopaedic Society for Sports Medicine
Canadian Orthopaedic Association
Canadian Orthopaedic Foundation
The AC (acromioclavicular) joint. Southern California Orthopedic Institute website. Available at: http://www.scoi.com/patient-resources/patient-education/ac-acromioclavicular-joint. Accessed December 3, 2013.
AC joint injuries. American Orthopaedic Society for Sports Medicine website. Available at: http://www.sportsmed.org/uploadedFiles/Content/Patient/Sports_Tips/ST%20AC%20Joint%20Injuries%2008.pdf. Accessed December 3, 2013.
Acromioclavicular (AC) joint separation. Cedars-Sinai website. Available at: http://www.cedars-sinai.edu/Patients/Programs-and-Services/Orthopaedic-Center/Clinical-Programs/Sports-Medicine/Acromioclavicular-AC-Joint-Separation.aspx. Accessed December 3, 2013.
Acromioclavicular (AC) joint injuries. EBSCO DynaMed website. Available at: http://www.ebscohost.com/dynamed. Updated September 6, 2012. Accessed December 3, 2013.
Acromioclavicular joint separation. Orthogate website. Available at: http://www.orthogate.org/patient-education/shoulder/acromioclavicular-joint-separation. Accessed December 3, 2013.
Shoulder separation. American Academy of Orthopaedic Surgeons Ortho Info website. Available at: http://orthoinfo.aaos.org/topic.cfm?topic=a00033. Updated October 2007. Accessed December 3, 2013.
Last reviewed December 2014 by Michael Woods, MD
Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.