In my practice, I often see patients who think they have a simple shoulder bruise after a fall, only to discover that the injury is actually at the acromioclavicular, or AC, joint. This is the small joint at the top of the shoulder where the collarbone meets the shoulder blade.
An AC joint dislocation is commonly called a shoulder separation. It often happens after a direct blow to the shoulder, and I see it frequently after road traffic accidents, sports injuries, falls at home, and workplace trauma in Bangladesh.
One important point I want Bangladeshi patients to understand is this: the visible bump on the shoulder does not tell the whole story. Some injuries look dramatic but recover well without surgery. Others look less severe at first yet remain painful or unstable. The right treatment depends on the grade of injury, pain, function, and the patient’s daily demands.
What the AC joint does
The AC joint is a small but important joint that helps connect the arm to the body. It allows the shoulder to move smoothly while the surrounding ligaments keep the collarbone and shoulder blade aligned.
When those ligaments are stretched or torn, the collarbone can shift upward and the shoulder contour changes. That is why many patients notice a lump or step near the top of the shoulder.
How AC joint dislocation happens
The most common cause is a fall directly onto the outer part of the shoulder. This can happen during cricket, football, cycling, motorbike accidents, slipping on wet ground, or falling from a height.
The force drives the shoulder downward while the collarbone remains in place. That mismatch stresses the ligaments around the AC joint. In more serious injuries, several stabilizing ligaments tear and the joint becomes clearly displaced.
Symptoms I look for
Patients with AC joint dislocation usually report:
- pain at the top of the shoulder
- swelling and tenderness over the AC joint
- pain when lifting the arm
- discomfort when bringing the arm across the chest
- a visible bump near the collarbone
- pain while sleeping on the injured side
- weakness or hesitation with overhead activity
In some cases, the shoulder still moves, but it hurts. In others, the pain is severe enough that the patient avoids using the arm at all. If the arm is numb, weak, or cold, that is more concerning and needs urgent assessment.
How I assess the injury
When I evaluate this problem, I start with the history of trauma and then examine the shoulder carefully. I look for tenderness over the AC joint, the amount of swelling, the shape of the shoulder, and whether the patient can raise the arm.
X-rays are usually the first test I rely on. They help confirm the separation, show how much the collarbone has shifted, and rule out an associated fracture. In some cases, I may ask for additional imaging if the injury pattern is unclear or if I suspect other shoulder damage.
Why the grade matters
AC joint injuries are usually graded from mild to severe. Lower-grade injuries often do well with non-surgical treatment. More severe injuries may create greater instability, more deformity, and a longer recovery.
Still, I do not decide treatment from the X-ray alone. I also consider pain, strength, work needs, sports demands, and whether the shoulder remains stable enough for daily life.
Treatment options
Many AC joint dislocations do not need surgery. In fact, a large number of patients recover well with conservative treatment, especially when the injury is not highly unstable.
Non-surgical treatment
Non-surgical care usually includes:
- sling support for comfort
- pain medicine when appropriate
- ice in the early phase
- rest from heavy lifting and overhead work
- gradual return of movement
- physiotherapy to restore shoulder control and strength
I usually explain to patients that non-surgical treatment does not mean doing nothing. It means protecting the joint while the ligaments heal and then rebuilding motion and strength in a planned way.
For many Bangladeshi patients, this is especially important because daily work often involves lifting, carrying, driving, or repeated arm use. Returning too early can keep the pain going and make recovery slower.
When I consider surgery
Surgery may be discussed when the injury is severe, the deformity is marked, pain remains significant, or the shoulder stays unstable despite proper rehabilitation.
I usually reserve surgery for selected cases rather than for every visible bump. Cosmetic concern alone is not always enough. What matters most is function, pain, and long-term use of the shoulder.
