TheAC jointis where theacromion(the tip of your shoulder bladescapula) meets yourclavicle(collarbone).
A thin layer ofsynovial fluidalso helps lubricate the joint.
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What Does AC Joint Pain Feel Like?

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AC joint pain is an ache at the top of theshoulderthat may be accompanied by tenderness.
The symptoms can be similar.
Arthritis
Arthritis is the most common source of AC joint pain.
Over time, the cartilage that cushions the joint wears away.
Eventually, bone spurs may develop, which are growths of bone that jut out from the joint.
The joint may also become larger.
Sprains, tears, andseparationsof theligamentsthat hold the joint together are the most common types of AC joint injury.
They usually follow a direct hit or fall onto the shoulder.
These injuries range from minor to incapacitating.
Two ligaments may be involved: the AC ligament and the coracoclavicular (CC) ligament.
It’s also possible to fracture your collarbone (clavicle), leading to AC joint pain.
Shoulder blade (scapula) fractures are less common.
Will Joint Pain Ever Go Away?
AC joint pain from arthritis tends to come and go but generally worsens over time.
Treatment
There are measures it’s possible for you to take to manage your AC joint pain.
You may also wear a sling temporarily to reduce movement.
It can generally take anywhere from a couple of weeks to two months.
Shoulder replacement requires rehabilitation and takes months to heal.
AC Joint-Friendly Exercises
Exercisecan help relieve pain, restore strength, and improve the range of motion.
Generally, start small and stop if it begins to hurt more than just a little.
Shoulder exercises may include:
Repeat or substitute these exercises as directed by your provider.
Are There Fast Ways to Heal?
The most efficient way to heal an AC injury is to follow your healthcare provider’s guidelines.
Avoid sleeping on the affected side and try a plump pillow under your arm to keep it elevated.
Try keeping your shoulder back rather than tilted forward.
you’ve got the option to also try a pillow or soft foam roller under your knees.
Summary
AC joint pain is very common but it can also disrupt your daily life.
The pain may be from arthritis or from an injury, which can include shoulder dislocation.
If it’s from arthritis, AC joint pain will usually worsen over time.
Shoulder replacement is an option for severe pain.
Your arm may feel weak, sore, or seem to click or pop when you move it.
UC Health.Acromioclavicular (AC) joint injury.
UC Davis.AC joint rehabilitation protocol.
Johns Hopkins Medicine.AC joint problems.
American Academy of Orthopaedic Surgeons.Shoulder separation.
American Academy of Orthopaedic Surgeons.Shoulder trauma (fractures and dislocations).
2021;12:73-85. doi:10.2147/OAJSM.S244283.
Arthritis Foundation.Position yourself for a good nights sleep.