What is acromioclavicular (AC) joint pain?
Acromioclavicular (AC) joint injury causes pain and inflammation in the joint at the top of the shoulder. It causes pinpoint tenderness and pain and is aggravated by bringing your arm across your body and above your head, especially with weight. It mainly affects those who lift weights in the gym and following a fall onto the outside of the shoulder i.e., falling off your bike. Acromioclavicular joint injuries do not always settle with conservative management. Physiotherapy and ultrasound-guided injections are effective treatment modalities.
What are the symptoms of acromioclavicular (AC) joint pain?
The symptoms of acromioclavicular (AC) joint injury are:
- Pain located on the top of your shoulder with tenderness when you touch the joint
- Pain lying on your side
- Pain if you move your arm across the midline of your body and above shoulder level
If this sounds like your pain, read on below…
What other conditions can mimic acromioclavicular (AC) joint pain?
If this does not sound like your pain, there are other conditions that can mimic the pain of acromioclavicular joint pain such as:
- shoulder joint osteoarthritis
- frozen shoulder
- shoulder impingement
- rotator cuff pain
- subacromial bursitis
Acromioclavicular (AC) joint pain vs shoulder osteoarthritis (OA)?
Acromioclavicular (AC) joint injury presents with pain on the top of the shoulder (above the arm) and tenderness when you touch the joint on the point of the shoulder. Whereas shoulder joint osteoarthritis (OA) does not cause such local pinpoint tenderness. Both conditions are characterised by pain caused by movements above the head, but acromioclavicular (AC) joint pain is specifically aggravated by movement across the midline of the body e.g., moving your arm across your neck.