Shoulder subluxation after stroke is a partial shift of the upper arm bone from its socket: the humeral head still touches the glenoid, unlike in a complete dislocation. With stroke-related weakness, this can develop when the affected arm lacks enough muscular support against gravity. Because it can begin early, may be painless, and can affect later movement, have any new change in shoulder shape, comfort, or control checked promptly, whether you notice it in yourself or in someone you care for.
What shoulder subluxation after stroke means
Your shoulder is a ball-and-socket joint. In glenohumeral subluxation, often shortened to GHS, the ball of the upper arm no longer sits in its usual relationship to the socket but has not fully separated from it. After stroke, this is most often seen on the weaker or paralyzed side.
Reported incidence ranges from 17% to 81% across studies. The range is wide because measurement methods and assessment times differ. About 73% of subluxations occur in the acute phase, often during the first three weeks of hemiplegia. The problem often becomes clinically apparent only after two to three months.
| Feature | What it means |
|---|---|
| Shoulder subluxation | The humeral head is partly displaced but still has contact with the glenoid socket. |
| Complete dislocation | The humeral head has lost contact with the glenoid socket. |
| Early window after stroke | Many cases occur during the first three weeks of hemiplegia. |
| Later presentation | Clinical signs often become noticeable after two to three months. |
After stroke, not every painful shoulder is subluxed, and not every subluxation hurts. In hemiplegic shoulder pain, possible contributors include subluxation, spasticity, limited external rotation, adhesive capsulitis, complex regional pain syndrome, and brachial plexus lesions. A clinician can sort out which of these contributors apply to you.
Why a hemiplegic shoulder can slip out of alignment
In a healthy shoulder, the four rotator-cuff muscles help keep the humeral head centered while the arm moves. After a stroke affects motor control, the supraspinatus and posterior deltoid may not provide enough active support. During the flaccid, low-tone phase, the arm’s weight can pull the humeral head downward. Without the usual work of the stabilizing muscles, it can shift downward, forward, or both.
Beyond muscle weakness, posture adds to the mechanical load. When weak back muscles lead to a forward-bent sitting posture, the shoulder blade tips forward, which can worsen the alignment. In less common situations, uneven spasticity can pull the humeral head forward. Spasticity in muscles such as the subscapularis can also block abduction and external rotation.
In everyday life, these situations can increase your risk:
- the arm is not supported while you sit or stand;
- the affected arm is pulled during a transfer from bed to wheelchair;
- the shoulder blade is moved incorrectly during handling or exercise;
- the arm is positioned poorly in bed, a chair, or a wheelchair.
For example, lifting or pulling a person by the paretic arm during a transfer puts traction through a shoulder that may already lack active support. Make sure everyone who helps you, from family to staff, knows that the affected arm is never a handle.
How a subluxed shoulder can feel and how clinicians check it
You may notice a pulling or heavy feeling in the affected arm. A loose or unstable sensation may come with a gap or dimple below the acromion, the bony point at the top of the shoulder. The contour may look different from the other side, and movement may be limited, especially when you lift the arm out to the side above 90 degrees.
Pain is not a reliable screening test. It can be mild to moderate, or absent, even with a clear change in position. Shoulder pain after stroke is still common: up to 84% of stroke survivors develop shoulder pain associated with subluxation and motor weakness. In one study of 107 people, the presence of GHS was significantly associated with shoulder pain at admission, discharge, and follow-up 30 to 40 days later.
What an assessment can include
Looking in a mirror is not enough to diagnose this problem. At the bedside, a clinician may palpate the gap between the acromion and humeral head using a 0-to-5 finger-width scale. A palpable gap of one-half finger width or more counts as subluxation. Ultrasound or X-ray can also measure the acromion-humerus distance; a larger distance correlates closely with clinical severity.
Contact a doctor or rehabilitation clinician promptly for new or worsening shoulder pain, a new visible change in contour, a new loss of movement, or any concern about the shoulder after stroke. A timely evaluation is especially important because pain can begin as early as two weeks after stroke, while more complete subluxation can develop over two to three months.
Protect the shoulder before everyday handling adds strain
Correct positioning in bed and in a wheelchair is the central preventive measure. Support the affected arm in a neutral shoulder position with pillows, an arm trough, or a lap tray. When muscle control is limited, that support reduces the arm’s downward pull.
Use a simple handling routine
- Before moving, check that the affected arm is supported rather than hanging.
- During a transfer, never pull on the paretic arm.
- When you are seated, use the prescribed arm support instead of letting the arm fall beside the chair.
- During passive movement, keep the shoulder blade supported and guided.
- Do not take passive flexion or abduction past 90 degrees without scapular support.
Without correct guidance of the shoulder blade, overhead movement raises the risk of pain. The 90-degree limit is not a home exercise prescription; it shows why your therapist’s handling and range-of-motion instructions matter. Ask your treatment team to show you and your family how to position and move the arm safely.
Another preventive option is early electrical stimulation. In a randomized trial, stimulation started within 48 hours of stroke and used for four weeks significantly prevented subluxation from developing, although that effect was no longer measurable after stimulation stopped. Canadian stroke guidance gives electrical stimulation in the first six months a weak recommendation for prevention.
Shoulder subluxation treatment combines support, movement, and stimulation
No single treatment works for everyone. Depending on your assessment, your rehabilitation plan may combine neuromuscular electrical stimulation, physical therapy, positioning, and selected mechanical support. Each tool has a different job: reducing the measured subluxation distance, protecting the arm during activity, easing pain, or rebuilding active control.
Electrical stimulation targets weak stabilizers
NMES commonly targets the supraspinatus and posterior deltoid. In a network meta-analysis, NMES was the most effective intervention for reducing subluxation distance. Research protocols report frequencies of 10 to 36 Hz, pulse widths of 200 to 300 microseconds, and treatment periods of four to eight weeks; your treating clinician decides whether NMES suits you and how it is set.
Timing matters. To limit progressive stretching of the joint capsule, NMES should start as early as possible, ideally within the first three months. It is not necessarily a permanent correction: in one study, improvements after six weeks of treatment and two weeks of follow-up did not persist once stimulation stopped. Even in chronic hemiplegia lasting more than six months, percutaneous NMES has shown improvements in subluxation and pain after six weeks and at three-month follow-up.
Physical therapy builds safer active movement
Physical therapy works on shoulder-blade stability, including scapular retraction and upward rotation, along with safe range of motion and active control. In sling-suspension exercise, the arm is partly unloaded so you can practice active movement against gravity. In one protocol, 40 minutes a day, five days a week, for four weeks improved subluxation distance, proprioception, Fugl-Meyer scores, and hand function compared with bilateral arm training.
Slings and kinesio taping have narrower roles
A sling can support the arm while you walk or stand, but it generally does not replace an armrest while you sit. Supports do not work the same way for everyone. In a comparison of four supports, the Rolyan Humeral Cuff Sling was the only one that significantly reduced total subluxation asymmetry, while individual participants responded best to different supports. Some slings hold the arm in a position that can contribute to soft-tissue contracture and affect symmetry, balance, and body image.
The evidence on kinesio taping looks different. In a network meta-analysis, it ranked highly for pain during activity and functional recovery, yet NMES was better for structural correction measured by distance. Because the evidence is conflicting, Canadian stroke guidance does not recommend shoulder taping for prevention or reduction of subluxation. Tape may have a place as an add-on; it is not a substitute for a full rehabilitation plan.
What to expect from recovery time
There is no single recovery timeline. Reduction is closely tied to meaningful motor recovery in the affected upper limb. In a six-month study, recovery of subluxation correlated with motor recovery; without a significant return of active shoulder movement, the subluxation tended to remain.
After four to six weeks of consistent therapy that combines NMES, physical therapy, and mechanical support, you may notice some improvement. That does not guarantee a fully corrected ultrasound or X-ray measurement. Over a longer period, structural correction can remain incomplete or need continued treatment to hold the gains. Without treatment, the connective tissue and joint capsule can remain stretched, and secondary adhesive capsulitis can follow.
Comfort and alignment are separate goals. In one network meta-analysis, corticosteroid injections ranked highest for resting pain but did not correct subluxation distance. Conversely, an approach that improves distance may not resolve every source of pain in a hemiplegic shoulder. Your care team should track both function and symptoms at follow-up.
For severe subluxation with pain that does not respond to therapy, surgery may be considered. In one case series of five people, arthroscopic suspension using biceps tenodesis had 80% patient satisfaction. This is a specialist decision, not routine care for a newly recognized shoulder change.
Common myths that can put a hemiplegic shoulder at risk
| Myth | What to know instead |
|---|---|
| If there is no pain, the shoulder is fine. | A person can have a clear change in shoulder position without pain. |
| Any sling will solve the problem. | Different supports have different effects, and some can alter alignment or restrict useful movement. |
| It is safe to lift the arm high during passive exercise. | Without scapular support, passive flexion or abduction should not exceed 90 degrees. |
| Kinesio tape puts the joint back in place. | Taping may help activity pain and function, but it is less effective than NMES for structural correction. |
| Waiting always lets it correct itself. | Meaningful reduction is linked to motor recovery; without effective intervention, subluxation can worsen. |
Don’t panic, and don’t wait passively. If your shoulder looks, feels, or moves differently after stroke, ask for an individualized rehabilitation assessment. The aim is to protect the joint while creating the conditions for active recovery.
Frequently Asked Questions
How do you fix a subluxed shoulder after stroke?
There is no one fix. Depending on your findings, treatment may combine clinician-directed NMES, physical therapy for shoulder-blade stability and active movement, careful positioning, and selected support or taping. The best plan depends on your stage of recovery and your symptoms.
What does shoulder subluxation feel like?
Symptoms vary. You may notice a pulling or heavy feeling, a dimple below the acromion, a changed shoulder contour, or difficulty lifting the arm to the side. Some people have no pain, so how it feels cannot confirm or rule it out.
How long does a subluxated shoulder take to heal?
There is no fixed timeline. Improvement is linked to return of active upper-limb motor control. After four to six weeks of consistent therapy, some people notice improvement, while structural correction can take longer or remain incomplete.
Is shoulder subluxation a complete shoulder dislocation?
No. In a subluxation, the humeral head is partially displaced but still touches the glenoid socket. In a complete dislocation, that contact is lost.
When should I see a doctor about a hemiplegic shoulder?
Seek prompt assessment for new or increasing shoulder pain, a new visible gap or contour change, reduced movement, or any concern about the shoulder after stroke. A clinician can determine whether subluxation or another cause is involved and guide safe handling and treatment.
