When is splinting recommended for AC joint injury?

The acromioclavicular joint connects the collarbone to the highest part of the shoulder blade. A fall or direct blow can sprain or separate the supporting ligaments. A sling can support the arm and make early movement more comfortable, but it does not repair a major separation. The appropriate support and wearing time depend on tenderness, deformity, arm function, skin condition, and whether a fracture or another shoulder injury is present.

Have the shoulder assessed if pain, swelling, or a visible bump follows an injury. Use the prescribed sling or support as directed, keep the hand and wrist moving if allowed, and avoid lifting or activities that sharply increase pain. Do not keep the shoulder completely still longer than advised, because stiffness can develop. Ask when gentle shoulder movement and physiotherapy should begin, and how the support should fit around the neck and elbow.

Seek urgent assessment if the hand becomes cold, pale, blue, very swollen, or numb, or if you cannot move the fingers. Get prompt medical advice for an obvious deformity, severe pain, an open wound, fever, or pain that is worsening rather than settling.

Is this a sprain, separation, or possible fracture? How long should I use the sling? Which movements are safe now, and when should I start shoulder exercises?