AC Joint Stabilisation

What is an AC Joint Stabilisation?

The Acromioclavicular or ‘AC’ Joint is supported by several ligaments. The joint itself has little movement, but it actually helps the entire shoulder blade move and rotate. It can get injured from a fall at high speed, such as from a bicycle or horse, or during contact and collision sports like AFL and rugby. Read more about Acromioclavicular instability here

An AC joint stabilisation is indicated for high grade AC joint separations and for those that do not improve with non-operative management. The procedure essentially involves restoring the normal position and anatomy of the clavicle (collar bone) in relation to the scapula (shoulder blade). To achieve this, various implants may be required, including surgical buttons, grafts and sometimes a plate. 

What’s involved in AC Joint Stabilisation surgery?

An AC joint stabilisation is performed via a small incision over the AC joint and outer part of the clavicle (collar bone). A drill hole is made through the clavicle and into the scapula, and a metallic surgical button is passed through a bony projection in the scapula called the ‘coracoid’. Strong sutures connect this button to a second button placed on top of the clavicle. The sutures are tightened and the clavicle is brought back to its normal position, restoring the anatomy of the AC joint. 

Arthrex - AC Dog Bone™ Button Technique

In older AC joint injuries, Dr Yu may opt to also utilise a hamstring graft to further strengthen the reconstruction. This is looped under the coracoid and around the clavicle to give additional stability and healing potential to the AC joint. This will sometimes need to be performed in conjunction with a temporary plate inserted at the AC joint. The plate is removed after 3 months. 


As with any surgical procedure, there is a small risk of:

    • Infection
    • Wound healing problems – very unlikely with keyhole incisions
    • Cardiovascular risks – stroke, heart attack, blood clots
    • Bleeding
    • Swelling of the operated limb – generally subsides within weeks
    • Pain – discomfort is expected after an operation, however pain medications are used in a routine manner to relieve this post-operative discomfort

Specific risks of AC joint stabilisation surgery:

    • Damage to nerves around the shoulder
    • Fracture (very rare)
    • Change in appearance of the AC joint
    • Recurrent instability 

What happens after the surgery?

Postoperative instructions and follow up

  • Immediate post-op 

After your operation you will be taken to the recovery room of the hospital, and allowed to have something to drink. When the team is happy the anaesthetic has worn off, you will be transferred to the day surgery area or to your inpatient room depending on whether you will be staying overnight. A sling / shoulder immobiliser would have been placed on your arm in the operating room, and should keep your arm comfortable and safe. If a nerve block has been performed by our anaesthetist, then your arm should feel comfortable but numb for up to 24-36 hours after the operation. When pins-and-needles are felt in the hand and arm then the block is starting to wear off, and your nursing staff will commence pain medication to keep you comfortable. 

  • Discharge from hospital 

On discharge from hospital you will be given:

      • Physiotherapy – instructions on exercises that should commence for the shoulder, elbow and wrist. You should not lift anything heavier than a ‘teacup’ for 6 weeks. 
      • Sling – instructions on the use of your sling. Typically after an AC joint stabilisation, Dr Yu will keep you in a sling for most of the time for 4-6 weeks, protecting the shoulder. 
      • Dressings – please keep dressings dry and do not remove them. 
      • Follow up appointment time
  • Follow up

A follow up appointment will have been made for you after the operation. This will typically be an appointment around the 2-3 weeks after the surgery to check the surgical incisions. If you have any concerns before this appointment, call Dr Yu’s clinic on (08) 7099 0188 to speak with us.

Preoperative instructions

  • Medication review – As part of your preoperative assessment, your current regular medications will be reviewed. This includes over-the-counter medications as well as supplements eg. Fish oil and glucosamine. You will be able to continue taking the majority of your regular medications, however some medications may be temporarily ceased. These are usually blood-thinning medicines (anti-coagulants) including (but not limited to) aspirin, warfarin, clopidogrel, apixaban. Diabetes medications including tablets and injections can usually be safely continued until the morning of the surgery. We will advise you when to stop taking these medications before the operation, and when to restart them after the operation.
  • Smoking  Smoking greatly impairs the blood supply to healing tissues by constricting the blood vessels, as well as creating problems with anaesthesia. If ever there was a good time to quit smoking, it is before an operation and during the recovery period. You will be advised of options to help ceasing smoking during this period, and ideally beyond.
  • Fasting – No solid food (including drinks containing milk) should be consumed within 6 hours before surgery. Clear fluids (such as cordial and water) may be consumed up to 3 hours before surgery, and then nothing should be taken from then (this includes chewing gum). An exception is made for regular oral medications, which can be taken with a small sip of water.
  • Cardiovascular fitness – An operation most often requires general anaesthesia (meaning you are put to sleep and breathing is assisted). Dr Yu and his anaesthetic team endeavour to make your anaesthetic as safe as possible by ensuring your heart and lungs are in optimal health. This may mean a pre-anaesthetic review by our anaesthetist involving a cardiovascular assessment, with blood tests and heart tracings performed.
  • Skin preparation – You should not shave or wax skin around the surgical area, as this can irritate the skin or cause superficial infections. Please advise us if you notice any skin lesions or abrasions around the operative area in the days before your surgery. Whilst waiting for your operation on the day of surgery, we will prepare the skin with antiseptic, and Dr Yu will mark the limb to be operated on.
  • Illness / colds – Please advise us if you have a cold or flu-like symptoms, or urinary-tract infections. Your surgery may need to be postponed while you recover from these infections. This is to ensure your surgery is performed as safely as possible for you.
  • Imaging – Please bring all relevant imaging with you to hospital (eg. X-rays / CT scans / MRI scans).
  • Arrival to hospital – Please present to the hospital surgical admissions area at least 2 hours before your planned surgery, or as advised by the hospital admission staff. If you are planned for an overnight admission to hospital following the operation, please bring your regular medications with you.
"My goals as a surgeon are to relieve pain, restore your function, and return you back to doing what you love."
Adelaide Shoulder Surgeon
Dr Raymond Yu
Shoulder | Elbow | Wrist Surgeon

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