What it is

The acromioclavicular joint sits at the top of the shoulder where the collarbone meets the acromion. Osteoarthritis in this area causes local pain when reaching across the body, pushing, and sleeping on the shoulder.

Many stay active with strength and load planning. Injections or surgery are options when pain persists.

What happens when it occurs

Cartilage thins, and the joint becomes sensitive to compression and shear. Nearby muscles guard the area, which adds to stiffness. Strength and smart movement reduce stress on the joint.

Common causes and risk factors

  • Age-related change and manual work
  • Heavy bench press and dips without progression
  • Prior AC joint sprain
  • Repetitive overhead tasks

Who is most affected

Manual workers and gym users who press frequently. Older adults with a history of AC sprain are also at risk.

Typical symptoms

  • Point tenderness over the AC joint
  • Pain with cross-body reach and at the top of a press
  • Sleep disturbance on the affected side

When to seek care

If pain limits pressing, pushing, or sleeping for more than two weeks.

How we diagnose

Clinical tests, such as cross-body adduction and O'Brien variations. X-rays help when planning injections or surgery.

Management

  • Modify pressing angles and volumes
  • Strengthen rotator cuff and scapular muscles
  • Improve thoracic and shoulder range
  • Consider image-guided injection for persistent pain
  • Surgical distal clavicle excision for selected cases

Rehabilitation milestones

Phase 1 weeks 0 to 3: settle pain, adjust training, gentle range.

Phase 2 weeks 3 to 8: heavy slow strength and scapular control.

Phase 3 weeks 8 to 16: progressive pressing and work tasks.

Phase 4 months 4 to 6: full return with pain-free range and strength.

Readiness to progress

  • Pain trended down during pressing tasks
  • Strength symmetry within 90 per cent
  • Sleep undisturbed by shoulder pain

Long-term care

  • Progress is pressing volumes gradually
  • Vary grip width and use landmine or incline options
  • Maintain shoulder and thoracic mobility

Australia snapshot

  • Common in gym and manual work populations
  • Image-guided injections are widely accessible
  • Surgical options are available in both public and private settings

Latest insights

Adjust your technique as you build strength. Joint-friendly angles make a difference.

Rotator cuff and scapular control reduce load on the AC joint.

Frequently Asked Questions

Not necessarily. Reduce volume, adjust the grip width, and use incline or landmine variations while rebuilding.

Only when pain persists despite good rehabilitation and injection.

It may provide temporary relief from pain. Keep training strength and technique.

Use pillows to support the arm and chest. Switch sides through the night if needed.

No, if it is painless. Painful clicks during pressing mean you should modify the task.