Shoulder subluxation: understanding this episode of instability and making your return safe

What is a shoulder subluxation?

Shoulder instability anatomy

The shoulder is the most mobile joint in the body, but also the least stable: the head of the humerus rests on a shallow glenoid surface, stabilised mainly by the ligaments, the labrum (a cartilaginous rim) and the rotator cuff.[1] A subluxation is a partial, temporary displacement of the humeral head out of the glenoid, which reduces on its own, unlike a complete dislocation.[2]

Why does this subluxation happen?

Subluxation most often occurs during a cocked-arm movement (external rotation, arm raised), the position where the shoulder is structurally most vulnerable, or following previous trauma that weakened the stabilising structures. Constitutional laxity or a lack of rotator cuff strengthening also increase the risk.

The structures that stabilise the shoulder

Shoulder stability relies on two types of structures:

• The passive stabilisers: the glenohumeral ligaments, the capsule and the labrum
• The active stabilisers: the rotator cuff and shoulder blade muscles, which actively compensate for the laxity of the passive structures

Symptoms and diagnosis of a shoulder subluxation

Typical sensations and their triggers

A subluxation feels like the shoulder briefly “jumping” or “giving way,” sometimes with temporary numbness in the arm, before it spontaneously slips back into place. It’s most often triggered by a cocked-arm movement (external rotation, arm raised).

Progression without full rehab

Without enough strengthening of active stability, subluxation episodes tend to recur, sometimes triggered by less and less extreme movements. Psychological apprehension can also set in around at-risk movements, limiting sporting confidence.

Differential diagnosis

After an episode of shoulder instability, a few distinctions are worth making:

• A complete dislocation, which needs to be reduced by a health professional, unlike a subluxation which reduces on its own
• Multidirectional instability, linked to constitutional hyperlaxity rather than an isolated traumatic episode
• A labral tear (SLAP) which can coexist with instability

Causes and risk factors

A subluxation results from an imbalance between the shoulder’s natural mobility and its capacity for active stabilisation.

Biomechanical and personal factors

• Constitutional joint laxity
• A lack of rotator cuff strengthening
• A history of similar episodes, which progressively weakens the passive structures
• Poor motor control of the shoulder blade

Which sports contribute to shoulder subluxation?

All sports that place the arm in a cocked position (arm raised, external rotation) carry a risk of this type of instability:

• Handball and volleyball
• Rugby, during tackles and contact
• Throwing sports (javelin, water polo)
• Judo and combat sports
• Climbing
• Skiing and fall-prone sports

Why do episodes often recur?

Each subluxation episode places a bit more strain on passive structures that are already weakened, without active stability necessarily having been strengthened in parallel. Without specific work on the rotator cuff and shoulder blade stabilisers, this cycle keeps feeding itself, which explains why recurrences are so common.

Treating a shoulder subluxation in rehab with a sports physio

The goal of treatment is to strengthen the structures that actively stabilise the shoulder (rotator cuff, shoulder blade stabilisers) to compensate for the laxity and prevent recurrence.

Phase 1 – Initial protection

Right after the episode, a few days of relative rest limits irritation to the weakened structures, before active rehab begins.

Phase 2 – Strengthening active stability

Strengthening the rotator cuff and shoulder blade stabilisers becomes the priority, to compensate for the laxity of the passive structures.

Phase 3 – Return to sport

The final phase progressively reintroduces at-risk movements (cocked arm) before a full return to training, with particular attention paid to rebuilding confidence in these movements.

In practice, this programme breaks down into 10 concrete steps:

1. 1Protection and reducing pain
2. 2Recovering pain-free mobility
3. 3Isometric strengthening of the cuff
4. 4Strengthening shoulder blade stability
5. 5Shoulder proprioceptive work
6. 6Closed-chain strengthening
7. 7Open-chain strengthening
8. 8Strengthening under sport-specific load
9. 9Progressive return to your sport
10. 10Return to competition

“An unstable shoulder is stabilised by muscle before it’s stabilised by surgery.”

Strengthening active stability, the cornerstone of treatment

Strengthening the rotator cuff and the shoulder blade stabilisers creates dynamic stability that compensates for the laxity of the passive structures (ligaments, labrum). Proprioceptive work, which trains the shoulder’s protective reflexes, is also essential.

In brief

• Strengthening the rotator cuff
• Shoulder proprioceptive work
• Strengthening the shoulder blade stabilisers
• Gradual return: mobility, then load, then sport

Should you rest or keep playing sport?

A period of relative rest is useful right after the episode, but prolonged rest isn’t the answer: it’s active strengthening that durably protects the shoulder against recurrence, to be reintroduced progressively as soon as the acute pain eases.

When should you see a specialist for a shoulder subluxation?

After a first episode, a medical opinion is recommended to assess the condition of the stabilising structures (labrum, ligaments) and discuss whether further tests are needed, particularly if episodes recur.

Healing time: how long does it take to stabilise your shoulder?

After a few days of relative rest, active strengthening generally spans 6 to 10 weeks. A full return to at-risk sports (cocked arm, contact) is safer between 2 and 4 months, giving active stability time to be fully restored.

Factors that speed up or slow down healing

Preventing recurrence

Subluxation frequently recurs if strengthening isn’t kept up once the initial discomfort has gone.

The 10% progression rule

Not increasing training volume or intensity by more than 10% per week, especially for cocked-arm movements, protects the shoulder during its phase of relative fragility.

Maintenance strengthening for the cuff

Regular resisted external rotation work, kept up even after the initial rehab has finished, maintains the shoulder’s active stability. It’s this ongoing strengthening that concretely reduces the risk of new episodes over the long term.

The HOPP care programmes to treat your shoulder subluxation and safely get back to sport

This instability requires complete strengthening and proprioceptive work to durably secure your shoulder. HOPP offers you a precise exercise programme, allowing you to get back to your activities as quickly as possible.

The programme runs from 3 to 9 weeks depending on the injury and ends with a reconditioning phase allowing a return to competition in the best possible conditions. Each programme is designed by the HOPP team, made up of two sports physiotherapists who are experts in assessing and treating athletes. You’ll also find theoretical content throughout your progression, so you master every aspect of your recovery and can adjust your treatment independently. If needed, our team of physiotherapists is on hand to support you.

A programme that adapts to you every day

Every day, how you feel (RPE) is factored in to automatically adjust the rest of your programme: more load if all is well, a bit less if your shoulder is complaining. This daily personalisation is what makes the difference compared to a fixed, paper-based programme.

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