The acromioclavicular joint, commonly called the AC joint, is the small joint at the top of the shoulder where the collarbone meets the shoulder blade. This joint can become painful due to arthritis, inflammation, injury, degeneration or irritation from surrounding soft tissue. AC joint pain is often felt on the top of the shoulder and may be worse with overhead activity, lifting, reaching across the body, gym exercises or lying on the affected side. In many cases, symptoms can improve with non-surgical treatment such as activity modification, physiotherapy, anti-inflammatory medication or injections.
AC joint debridement is a minimally invasive keyhole procedure used to remove inflamed, damaged or irritated tissue from around the AC joint. Surgery may be considered when pain persists despite non-surgical treatment and is affecting shoulder function, comfort or activity.
AC joint arthritis may develop gradually with age and repetitive use, or following a previous injury such as an AC joint separation. Repetitive heavy lifting may also contribute to a related condition called distal clavicle osteolysis, which involves stress-related changes to the bone at the end of the collarbone.
AC joint arthritis is common to see on X-rays and MRI scans, particularly with increasing age, but it does not always cause symptoms. For this reason, imaging findings need to be considered together with the location of pain, examination findings and the response to treatment. AC joint pain can also occur alongside other shoulder problems, including rotator cuff conditions or pain arising from the main shoulder joint. A careful assessment is therefore important to confirm whether the AC joint is the main source of symptoms.
The procedure is generally considered only after the AC joint has been confirmed as the main source of pain. This is important because arthritic changes are commonly seen on imaging and may not always be responsible for a patient’s symptoms. In suitable patients, surgery may involve removing inflamed or damaged tissue and a small amount of bone from the end of the collarbone. This creates space between the clavicle and acromion so the painful joint surfaces no longer rub against each other. This procedure is also known as a distal clavicle resection.
The decision to proceed with surgery depends on the duration and severity of symptoms, examination and imaging findings, response to previous treatment, associated shoulder conditions and the patient’s individual activity requirements.
Imaging findings must be considered together with the patient’s symptoms and examination. AC joint changes are commonly seen on scans in people without shoulder pain, so arthritis visible on imaging does not necessarily mean that the joint is causing the symptoms.
In selected cases, a local anaesthetic and corticosteroid injection may be placed into the AC joint. Temporary pain relief following the injection can help confirm that the joint is the likely source of symptoms. The assessment helps determine whether the AC joint is responsible for the pain, whether another shoulder condition also requires treatment, and whether continued non-surgical care or arthroscopic AC joint debridement is the most appropriate option.
Arthroscopic AC joint debridement is usually performed as a day procedure or single overnight stay, under general anaesthesia. During the procedure, Dr Richard Dallalana inserts a small camera called an arthroscope through small incisions around the shoulder. This allows the AC joint and other shoulder structures to be examined and helps identify any associated problems that may also require treatment.
Inflamed tissue and any prominent bone spurs around the AC joint are removed. A small amount of bone is then carefully removed from the end of the collarbone (distal clavicle) to create a space between the collarbone and the acromion. This prevents the painful joint surfaces from rubbing against each other while preserving the surrounding ligaments that help maintain AC joint stability. This part of the procedure is also known as a distal clavicle excision (or resection).
A post-operative medical review
At approximately 2 weeks, to remove the dressings, assess wound healing, discuss the surgical findings and guide the next stage of rehabilitation.
Recovery after arthroscopic AC joint debridement focuses on reducing pain, restoring shoulder movement and gradually rebuilding strength and function. As there is usually no tendon or ligament repair to protect, gentle shoulder movement can often begin soon after surgery. During the early recovery period, some pain, swelling and tenderness over the top of the shoulder are expected. A sling may be used briefly for comfort, but patients are generally encouraged to gradually reduce its use and begin moving the shoulder as able.
Rehabilitation typically includes:
Light strengthening under physiotherapy guidance begins once pain is settling and shoulder movement has improved. Exercises may focus on the rotator cuff, shoulder blade muscles and the wider upper limb.
Daily tasks, gym exercises, work duties and recreational activities are reintroduced gradually. Heavier lifting, pressing exercises and repetitive overhead activity should be delayed until adequate movement, strength and control have returned. Physiotherapy may help guide exercise progression and ensure that loading is increased at an appropriate rate. Rehabilitation should be based on symptoms rather than forcing movement through significant pain.
Tenderness over the end of the collarbone may remain noticeable for up to approximately 12 weeks, and full strength may require this length of recovery.
Recovery may take longer when AC joint debridement is performed with another shoulder procedure.
The timing of your return to work, driving and sport after AC joint debridement will depend on pain, shoulder movement, strength and the physical demands of the activity. Recovery may take longer if another shoulder procedure is performed at the same time.
Desk-based or light duties may be possible within a few days, depending on comfort and the need for strong pain relief medication.
Light manual work 2 to 6 weeks depending on pain levels and work demands.
Jobs involving lifting, pushing, pulling, repetitive overhead activity or heavy manual work usually require a longer recovery period (6 to 12 weeks) and may need a staged return.
You should not drive while wearing a sling or taking medication that affects alertness.
Driving may resume when you can comfortably control the steering wheel, operate all vehicle controls and perform an emergency manoeuvre safely. This is usually between 2 days and 1 week following surgery.
Walking and lower-body exercise may begin within a few days. Shoulder-based exercises should be reintroduced gradually as movement and strength improve. Light gym exercises, swimming and non-contact sports may be introduced from around 4 weeks. Heavier lifting, pressing movements, repetitive overhead exercise and high-demand sport should be delayed until adequate movement, strength and shoulder control have returned, and will vary from 6 to 12 weeks following surgery.
Arthroscopic AC joint debridement is generally considered a safe procedure, but all surgery carries potential risks. These will be discussed with you before treatment.
Persistent symptoms can occur if the AC joint was not the main source of pain, if another shoulder condition is present, or if an insufficient amount of bone is removed. Complications following arthroscopic distal clavicle excision are generally uncommon, and the arthroscopic approach has been associated with a low rate of early complications. Recovery and outcomes vary depending on the severity of the AC joint changes, associated shoulder conditions, general health and participation in rehabilitation.
A specialist assessment helps determine whether the AC joint is the main source of symptoms in the shoulder and to guide treatment.
Non-surgical treatment is usually considered first and may include activity modification, physiotherapy, medication and, in selected cases, an injection into the AC joint. When pain remains significant despite appropriate treatment, and the AC joint has been confirmed as the likely source of symptoms, arthroscopic AC joint debridement may be discussed. Treatment recommendations are tailored to the severity of symptoms, imaging findings, associated shoulder conditions, occupation, activity level and individual goals. Dr Dallalana will explain the available options, expected recovery and whether surgery is likely to be appropriate for your circumstances.
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