A dislocated shoulder produces a visibly deformed, out-of-place joint that looks squared off rather than rounded, intense pain, and an immediate inability to move your arm. If your shoulder looks wrong and you can’t move it after a fall, impact, or forceful twist, you’re likely dealing with a dislocation and need emergency medical care to have it put back in place.
What a Dislocated Shoulder Looks and Feels Like
The most obvious sign is visual. A dislocated shoulder loses its normal rounded contour and instead appears flat or angular on the outer edge. You may see a visible bulge where the ball of the upper arm bone has shifted forward (the most common direction) or, less often, toward the back. Swelling and bruising develop quickly around the joint.
The pain is severe and constant, not the kind that comes and goes. Most people instinctively hold the injured arm close to their body with the other hand, because any movement at the shoulder sends a sharp spike of pain. Reaching overhead, rotating the arm, or lifting anything is essentially impossible. This total loss of movement is one of the clearest distinctions between a dislocation and a less serious injury like a strain or bruise, where you’d still have at least some range of motion.
Some people also notice numbness or tingling on the outer side of the shoulder and upper arm. This happens because the nerve that runs close to the shoulder joint can get stretched or compressed when the bone shifts out of position. Weakness in the muscle that caps the shoulder (the one you use to lift your arm sideways) is another sign of nerve involvement. These sensory changes don’t happen in every case, but when they do, they’re a strong indicator that the joint has fully dislocated.
Subluxation vs. Full Dislocation
Not every episode of the shoulder “slipping” is a full dislocation. A subluxation happens when the upper arm bone partially slides out of the socket and then slips back in on its own, often within seconds. You’ll feel a sudden sensation of the shoulder giving way, followed by pain and a deep sense of looseness in the joint. This giving way tends to happen during specific movements like throwing, reaching behind your back, or stretching your arm overhead.
With a full dislocation, the bone comes all the way out and stays out. It may eventually shift back on its own after some time, but more often it needs to be repositioned by a medical professional. The practical difference you’ll notice: a subluxation is a brief, alarming slip followed by aching and instability, while a full dislocation leaves your shoulder visibly misshapen and locked in pain until it’s treated. Both cause swelling and reduced range of motion, but the deformity and inability to move the arm at all point to a complete dislocation.
What to Do Before You Get to the ER
Do not try to force your shoulder back into place yourself. The most common complication of attempting self-reduction is a fracture of the upper arm bone, especially in older adults. You can also trap nerves or damage blood vessels in the process, turning a straightforward dislocation into a much more serious injury.
Instead, immobilize the arm in the position that feels least painful. If you have a piece of cloth roughly five feet wide at the base, you can fold it diagonally into a triangle and fashion a sling: place your elbow at the top point of the triangle, rest your wrist along the bottom edge, and tie the two free ends behind your neck. Your arm should rest against your chest with your elbow bent at a right angle and your hand slightly higher than the elbow. A belt, necktie, or even a buttoned jacket can work in a pinch. If possible, wrap another strip of fabric around your chest and the sling to keep the arm from shifting during transport.
Apply ice wrapped in a cloth to the shoulder to help control swelling while you wait for or travel to medical care.
What Happens at the Hospital
Doctors typically order an X-ray before doing anything else, both to confirm the dislocation and to check for fractures. Bone dents on the head of the upper arm bone are a common finding after dislocations, as the ball of the joint can chip or compress against the rim of the socket on its way out. The cartilage lining the socket rim also frequently tears during the event.
To reposition the joint, doctors use sedation or local pain control so your muscles relax enough for the bone to slide back into place. This is a controlled procedure done with specific techniques to minimize the risk of fracture or nerve damage. Once the joint is back in position, the relief is usually dramatic and almost immediate, though soreness and swelling persist for days.
Recovery and the Risk of It Happening Again
For a straightforward first dislocation, the shoulder joint generally improves over a few weeks of rest and immobilization in a sling. Physical therapy follows, focusing first on gentle range of motion and then on rebuilding strength in the muscles that stabilize the joint. If surgery is needed (more likely with significant cartilage or bone damage), you’ll wear a sling for about six weeks and gradually progress through rehabilitation. Full recovery from surgery typically takes five to six months.
Your age at the time of your first dislocation is the single biggest predictor of whether it will happen again. Recurrence rates in people under 20 are as high as 90%, largely because younger patients tend to return to high-demand sports and because their connective tissue hasn’t fully matured. For people over 40, recurrence drops to somewhere between 6% and 17%. This is why younger patients are more often recommended for surgical repair early on, rather than waiting to see if the shoulder re-dislocates.
After any dislocation, the shoulder is permanently more vulnerable. The stretching of the joint capsule, along with any cartilage tears that occurred, makes it easier for the bone to slip out again during overhead movements, contact sports, or even routine reaching. Consistent strengthening of the rotator cuff and the muscles around the shoulder blade is the most effective way to reduce that risk over the long term.