Shoulder Subluxation: When the Shoulder Slips Partway Out

A shoulder subluxation means the ball of the upper arm slips partway out of its socket and then slides back in by itself, usually within seconds. It often happens when the arm is forced up and back, in a tackle, a fall or a hard throw. Most people recover with a short break from that position and a rotator cuff and shoulder blade strengthening program, often over 6 to 12 weeks. A full dislocation, by contrast, stays out until it is put back.

A single subluxation can still tear the rim of cartilage around the socket, so I’d have it checked, especially if you are young or play a contact or overhead sport.

Key takeaways

What it is: the ball of the shoulder slips partway out of the socket and goes back in by itself.
How it differs from a dislocation: a dislocated shoulder comes fully out and usually has to be put back.
Common direction: most subluxations slip forward, with the arm raised and turned back.
Typical recovery: daily tasks often within a few weeks; contact and overhead sport often 6 to 12 weeks, sometimes longer.
Repeat episodes: more likely in people under about 25 and in contact sport, and a reason for assessment.

Partway out, fully out, or loose?

Subluxation: one episode, often after a clear injury, where the shoulder slipped and went back in by itself.
Dislocation: the shoulder came fully out and stayed out, often needing to be put back in the emergency department. Dislocated shoulder recovery covers that injury.
A loose shoulder: repeated slipping, often without a big injury, in people with flexible joints. Shoulder instability without a dislocation covers that longer-running pattern.

Shoulder subluxation after a stroke is a different situation: weak muscles let the arm’s weight pull the ball down, and it is managed by the stroke team.

Where are you right now?

It has just happened: read the week-by-week section and the safety sections first.
Weeks in and it still feels unsteady: go to “If it isn’t going to plan”.
After surgery: if you have had a repair, shoulder stabilization surgery recovery fits better, and your surgeon’s protocol comes first.
Getting back to work or sport: see the “When can I…” table.

Week by week

Days 1 to 7: the shoulder is sore and may feel weak. A sling for comfort for a few days is common. Keep the elbow, wrist and hand moving, and avoid the arm up and turned back.
Weeks 1 to 3: gentle movement in front of the body. Rotator cuff holds, with the elbow by your side, usually start here.
Weeks 3 to 6: rotator cuff strengthening and shoulder blade work, arm low and close to the body. Most daily tasks are comfortable by now.
Weeks 6 to 12: training moves toward shoulder height, then the position it slipped in, with more speed and load. Return to contact or overhead sport is usually considered once strength is close to the other side.

Where else this could be coming from

Labral tear: a tear in the cartilage rim can follow a subluxation. Deep pain with catching or clunking that persists after the first weeks points this way.
Rotator cuff tear: more likely after about 40. Weakness lifting the arm that does not ease as pain settles suggests a torn rotator cuff.
AC joint: pain on the bony point at the top of the shoulder after landing on it is more often a separated shoulder.
A stinger: a burning, dead arm after a blow to the neck or shoulder, without a slipping feeling, comes from the nerves running from the neck to the arm.
Harmless clicking: a painless click with no slipping feeling is common and is usually not a subluxation.

A shoulder that slipped once is asking for strength in the position it slipped in, built a few weeks at a time.

Is this normal?

“My arm went dead for a few seconds.” Common. A brief heavy, numb or tingling arm as the ball slips usually passes within seconds to minutes.
“It went back in, so why does it still ache?” The capsule and muscles around the joint were stretched. An ache for 1 to 2 weeks is common.
“I don’t trust it overhead.” Common for several weeks. Confidence usually returns as strength builds in that position.

If it isn’t going to plan

It is week five. Reaching back for your bag on the back seat of the car still makes the shoulder feel like it might shift, so you twist your whole body instead. The thought in your head is that it slipped once, so keeping it still is the safe choice.

Keeping it still feels protective, but the rotator cuff and shoulder blade muscles are what hold the ball centered as you move. Weeks of guarding weaken them, and the shoulder stays unsteady in the positions you have stopped using. If it keeps slipping, there may also be a tear in the cartilage rim that exercise alone does not address.

If you are 6 weeks in and still guarding the arm, or it has slipped again, I’d get it assessed by a physical therapist or a doctor who treats shoulders. These are the questions I’d ask:

Damage: could the labrum or bone have been injured, and do I need a scan?
Risk: how likely is it to happen again, given my age and sport?
Surgery: at what point would a stabilization opinion be worth getting?

When can I…

Activity	Typical range
Sleep on that side	Often 2 to 6 weeks after a subluxation
Drive	Often within 1 to 2 weeks, once you can steer and brake safely
Reach overhead	Often 4 to 8 weeks, built up gradually
Lift	Light loads close to the body within 1 to 3 weeks; heavier lifting often 6 to 12 weeks
Desk work	Often within a few days
Manual work or sport	Often 6 to 12 weeks; contact and throwing sports at the longer end

If you have had surgery, your surgeon’s protocol comes first.

Call your local emergency number or go to the emergency department if

Still out: the shoulder looks out of shape and has not gone back in.
Circulation: the arm or hand turns cold, pale or blue.
Numbness that stays: the arm stays numb or will not move after the shoulder has gone back.

See a doctor today if

A numb patch: numbness over the outer upper arm, or new weakness lifting the arm out to the side.
Over 40 and weak: you cannot lift the arm to shoulder height after the episode.
Severe pain: pain not controlled by the medicine you have been advised to take.

Get it checked soon if

A second episode: the shoulder has slipped again, even if it went back in.
Slipping with small tasks: it shifts during everyday reaching or in sleep.
Catching or clunking: a deep catch or clunk that is still there after 3 to 4 weeks.
Repeated dead arm: the arm goes dead during throwing or overhead work.