Shoulder impingement syndrome
This is when certain structures in the shoulder (a tendon or the subacromial bursa) are pinched or jammed during shoulder movements. These structures become irritated and painful. This pinching takes place in the area of the shoulder known as the subacromial space.
.png){kind=small}
.png){kind=small}
.png){kind=small}
Shoulder impingement syndrome accounts for 44 to 65% of all consultations for shoulder pain. If you feel pain when you raise your arm between 60 and 120 degrees, you may be one of the thousands of Quebecers affected each year.
Here's the good news: impingement syndrome responds very well to conservative treatment. Your shoulder is more adaptable than you think, and 70% of people see significant improvement with physical therapy.
You will discover what really causes this syndrome, how to recognize it, and how physical therapy can help you regain a pain-free shoulder.
What is shoulder impingement syndrome?
Shoulder impingement syndrome occurs when the rotator cuff tendons and the subacromial bursa get pinched in the subacromial space, which is the area between the head of the humerus (upper arm bone) and the acromion (part of the shoulder blade that forms the roof of the shoulder).
Imagine this space as a narrow tunnel through which your tendons pass every time you raise your arm. When this space narrows or the structures become inflamed, repeated friction causes irritation and pain.
The rotator cuff is a group of four muscles that stabilize the shoulder. The tendons most commonly affected are those of the supraspinatus and infraspinatus. The subacromial bursa acts as a cushion between the acromion and the tendons, reducing friction.
Impingement syndrome particularly affects people aged 40-60. Now that you understand the structures involved, let's look at how to differentiate this syndrome from other shoulder problems.
How can you tell the difference between impingement syndrome and other shoulder problems?
Impingement syndrome describes a mechanical issue (subacromial compression), while rotator cuff tendinopathy describes a problem with the tendon tissue itself. Repeated impingement can lead to tendinopathy, and vice versa; the two often occur together.
Subacromial bursitis is often a consequence of impingement syndrome. Repeated irritation of the bursa causes it to become inflamed and thickened, further reducing the available space.
Capsulitis (frozen shoulder) is characterized by severe loss of mobility in all directions, whereas snapping syndrome causes pain in a specific arc without major loss of passive mobility.
Each condition requires a tailored approach. Let's now explore the characteristic symptoms.
What are the symptoms of shoulder impingement syndrome?
The characteristic painful arc
The most telling symptom is the painful arc: pain when you raise your arm between 60 and 120 degrees. Paradoxically, the pain often decreases beyond 120 degrees, once the compressed structures are out of the pinching zone.
Location and type of pain
The pain is located at the front or top of the shoulder and may radiate to the elbow. It is described as a pinching sensation during movement. At rest, it may be absent in the early stages but becomes constant in chronic cases.
Nighttime pain
Nighttime pain is particularly common. Many report waking up at night, especially when sleeping on the affected shoulder.
Problematic activities
Typically painful tasks:
-
Wash or dry your hair
-
Put your hand behind your back (fasten your bra, take out your wallet)
-
Store items high up
-
Put on a coat
-
Playing sports with your arms raised (tennis, volleyball, swimming)
The syndrome develops gradually over several weeks or months. Sudden pain after trauma suggests an acute tear.
If you recognize these symptoms, you are probably wondering what is causing them.
Those who have had the greatest impact on my patients' lives. 1 per day, 2 min.
// UTM tracking on interaction only (not on page load)
(function(){
var added = false;
function addUtm() {
if (added) return;
var url = new URL(window.location.href);
if (url.searchParams.has('utm_source')) return;
var path = window.location.pathname;
var parts = path.split('/').filter(Boolean);
url.searchParams.set('utm_term', parts[parts.length - 1] || 'homepage');
url.searchParams.set('utm_source', parts[0] || 'direct');
url.searchParams.set('utm_medium', 'cta-inline-form');
window.history.replaceState({}, '', url.toString());
added = true;
}
document.querySelectorAll('iframe[src="clikzi.com"]').forEach(function(iframe) {
iframe.addEventListener('focus', addUtm);
iframe.parentElement.addEventListener('click', addUtm);
});
document.querySelectorAll('a[href="clinicmaster.com"]').forEach(function(link) {
link.addEventListener('click', function() {
var path = window.location.pathname;
var parts = path.split('/').filter(Boolean);
var linkUrl = new URL(link.href);
if (!linkUrl.searchParams.has('utm_source')) {
linkUrl.searchParams.set('utm_term', parts[parts.length - 1] || 'homepage');
linkUrl.searchParams.set('utm_source', parts[0] || 'direct');
linkUrl.searchParams.set('utm_medium', 'cta-rdv');
link.href = linkUrl.toString();
}
});
});
})();
HTML_BLOCK_3
HTML_BLOCK_4
What REALLY causes shoulder impingement syndrome?
Many believe that impingement syndrome is caused by a 'hooked' acromion or a 'lack of natural space,' an anatomical feature that cannot be changed. This view is disheartening because it suggests you are limited by your bone structure.
Here's the reality: while anatomy plays a role (30% of people have a hooked acromion)1, the majority of impingement syndromes are caused by functional factors that can be changed with the right treatment2.
Scapulohumeral rhythm dysfunction
Your shoulder blade needs to move in sync with your upper arm bone (humerus). If the shoulder blade doesn't move correctly due to weak muscles (like the lower trapezius or serratus anterior) or tight muscles (like the pectoralis minor), the subacromial space narrows, and the tendons get pinched3. It's like a door with misaligned hinges that rubs against its frame.
Muscle imbalances
The rotator cuff muscles center the head of the humerus in the joint. If some are weakened (supraspinatus, external rotators) while others are tense (deltoid, pectoralis major), the head of the humerus migrates upward and reduces the space.
Posterior capsular stiffness
A loss of flexibility in the posterior joint capsule forces the head of the humerus to move forward and upward, which increases subacromial compression4.
Poor posture
A forward head posture and rounded shoulders tilt the shoulder blade forward, reducing the subacromial space5. If you work long hours at a computer, this posture can be a significant contributing factor.
Anatomical factors
About 30% of people have an acromion shape that naturally reduces the space. However, this doesn't necessarily mean they will develop the syndrome, only if other functional factors are also present.
The liberating message
If your syndrome were solely due to your bone anatomy, you wouldn't be able to do anything without surgery. But since the majority of cases are primarily functional, you can improve your condition by correcting muscle imbalances, posture, and movement patterns – which is exactly what physiotherapy does.
You are not "broken." Your shoulder needs to relearn how to move properly.
How is shoulder impingement syndrome diagnosed?
The diagnosis is based on clinical assessment by a qualified professional. Your physical therapist can make this diagnosis without first consulting a doctor.
Symptom history
Questions about: onset and progression of symptoms, activities that cause or relieve pain, nighttime pain, work and sports activities.
The physical examination
Specific tests reproduce the characteristic pain:
-
Neer test: Passively raise your arm in internal rotation.
-
Hawkins-Kennedy test: Arm bent at 90 degrees then turned inward
-
Painful arc test: Actively raise the arm to identify the painful area.
Assessment of muscle strength, joint mobility, and scapular movement analysis.
Imaging tests: rarely necessary
Clinical evaluation is usually sufficient. Imaging is recommended if: no improvement after 12 weeks of physical therapy, suspicion of complete tear, recent trauma.
Important: Many asymptomatic individuals show abnormalities on imaging. Their presence does not mean that they are causing your pain.
Now let's see what physical therapy can do.
What is the physiotherapy treatment for snapping syndrome?
Physical therapy is the first line of treatment, with a 70% success rate. The approach restores normal function by addressing the functional causes.
For a comprehensive guide, see our article on physical therapy for shoulder pain.
The objectives
-
Reduce pain and inflammation
-
Restore range of motion
-
Correct muscle imbalances
-
Improve neuromuscular control
-
Change postural habits
-
Prevent recurrence
Manual therapy
Joint mobilization to restore mobility and reduce pain. Relaxation of tense muscles (pectoralis minor, upper trapezius). Capsular stretching for posterior capsule flexibility.
Studies show that manual therapy combined with exercises yields better results than exercises alone.
Progressive Exercise Program
Phase 1: Pain and Mobility Control (Weeks 1-3)
Pendulum exercises, gentle stretching, basic scapular mobility, temporary avoidance of very painful movements.
Phase 2: Strengthening stabilizers (weeks 3-8)
Strengthening of the rotator cuff in pain-free areas, strengthening of the scapular muscles (lower trapezius, serratus anterior), neuromuscular control exercises.
Phase 3: Functional strengthening (weeks 8–12+)
Weight-bearing exercises, specific functional exercises, progression to overhead movements, prevention of recurrence.
Education
How to temporarily modify activities, compensatory strategies, good work posture and sleep, appropriate balance of activities.
Treatment duration
Significant improvement in 6 to 12 weeks. Chronic cases require more time.
Factors accelerating recovery: early consultation, adherence to exercises, modification of aggravating activities.
When to consider other treatments
If there is no response after 3 to 6 months of proper physical therapy: corticosteroid injection, thorough medical evaluation.
Remember that 70% improve with physical therapy alone. Patience and consistency in exercising are your best allies.
Need professional advice?
Our physical therapists can assess your condition and offer you a personalized treatment plan.
What exercises can you do at home for snapping syndrome?
Home exercises are essential. Here are some basic exercises, but consult a physical therapist who will tailor the program to your situation.
Mobility Exercises (Initial Phase)
1. Pendulum Exercises (Codman)
Lean forward, placing your healthy hand on the table. Let your sore arm hang freely. Make small circles in each direction (10 repetitions). Swing forward and backward, then left and right. Frequency: 3-4 times a day.
2. Pectoralis minor stretch
Forearm against door frame (elbow at 90 degrees). Move your foot slightly forward, turn your body in the opposite direction. Hold for 30 seconds, repeat 3 times. Frequency: 2-3 times per day.
3. Posterior capsule stretch (sleeper stretch)
Lie on your painful side with your arm at a 90-degree angle in front of you. With your other hand, gently push your hand down. Hold for 30 seconds and repeat three times. Frequency: twice a day.
Strengthening Exercises (Intermediate Phase)
4. External Rotation with Resistance Band
Elastic band at elbow height. Elbow pressed against the body, bent at 90 degrees. Pull the elastic band outward. 3 sets of 12-15 repetitions. Frequency: once a day, 5-6 days/week.
5. Scapular retraction (rows)
Elastic band in front of you at chest height. Pull your elbows back and bring your shoulder blades together. 3 sets of 12-15 repetitions. Frequency: once a day.
6. Scapular elevation (wall slides)
Stand facing the wall, arms in a "soccer goal" position. Slide your arms up along the wall. 3 sets of 10 repetitions. Frequency: once a day.
Important Principles
Gradual Progression: Master mobility before moving on to strengthening.
Acceptable Pain: Slight discomfort is okay (2-3/10), but moderate pain (5+/10) means it's too aggressive.
Consistency: 10 minutes every day is better than 60 minutes once a week.
Patience: Tissue changes take time. Expect progressive improvements over 8-12 weeks.
A physical therapist will identify the exercises that are most important for your situation.
Can You Treat Shoulder Impingement Syndrome On Your Own?
Self-treatment can relieve mild shoulder impingement syndrome (e.g., ice, rest, gentle stretches). However, without correcting posture and shoulder blade biomechanics, the impingement will persist. Without an accurate diagnosis, you risk maintaining compensatory movements or doing counterproductive exercises that delay healing.
A physiotherapist corrects scapular dyskinesis and optimizes the subacromial space. An assessment helps identify the exact cause, rule out any serious underlying issues ('red flags'), and create a progressive treatment plan. The exercises are tailored to your specific condition, not generic.
Our approach: professional assessment + supervised home exercise program = better long-term results.
Are you hesitating between self-treatment and a consultation? Free 15-min consultation to discuss your situation.
How can shoulder impingement syndrome be prevented?
Prevention is based on simple but effective strategies.
Maintain muscle balance
Regular strengthening of the rotator cuff (2-3 sessions/week with elastic bands). Strengthening of the scapular muscles (lower trapezius, serratus anterior). Stretching of the anterior muscles (pectoralis minor, pectoralis major).
Optimize posture
At work: monitor at eye level, armrests to support arms, frequent breaks (every 30-45 minutes).
General posture: Regularly 'lengthen' your spine with your chin tucked in and shoulder blades slightly down and back. This position optimizes the subacromial space.
Modify movement techniques
Lifting objects overhead: raise your shoulders slightly before lifting. Sports involving repeated overhead movements: adequate warm-up, appropriate technique, gradual progression in volume (10% rule).
Sleep management
Avoid sleeping on the painful shoulder or placing your arm under the pillow. When sleeping on your side, place a pillow between your arms to support your upper shoulder. Ensure your neck is well supported.
Dosage and load management
Gradual progression if resuming activity after a break. Respect pain signals: slight stiffness after new activity = normal. Pain persisting for more than 24 hours = too much.
Maintain mobility
Thoracic mobility: extensions on foam roller, thoracic rotations. Posterior capsule mobility: sleeper stretch 2-3 times/week, even after recovery.
What is the prognosis for shoulder impingement syndrome?
The prognosis is generally good with appropriate treatment.
Success rate
Approximately 70% of people treated with physical therapy report significant improvement.
Recovery time
Acute Syndrome (up to 6 months): Noticeable improvement in 8-12 weeks. Full recovery in 3-6 months or more. Good prognosis, but slower.
Complications if left untreated
If left untreated, chronic irritation can progress according to Neer's model:
Stage I (Edema and Inflammation): Typically seen in individuals around 40 years old, partial or complete tear, may require surgery.
This increase highlights the importance of early treatment, before permanent damage occurs.
Risk of recurrence
Approximately 40% report persistent or recurring symptoms after 3 years. However, this rate often reflects: incomplete recovery, return to aggravating activities without modification, absence of a maintenance program.
People who complete the full program and now do maintenance exercises have a much lower relapse rate.
The encouraging message
Most impingement syndromes resolve with proper conservative treatment. The key is patience, consistency in exercises, and collaboration with a physical therapist.
You don't have to live with this pain. Your shoulder can heal and regain full function.
When should you seek medical advice for shoulder impingement syndrome?
When to see a physical therapist
Consult if:
-
Persistent shoulder pain lasting >7–10 days despite rest
-
Characteristic painful arc (60-120 degrees)
-
Nighttime pain that regularly wakes you up
-
Pain limiting daily activities
In Quebec, you do not need to see a doctor before consulting a physical therapist.
When to see a doctor
Consult a doctor immediately if:
Warning Signs:
-
Shoulder pain with chest pain, shortness of breath (call 911)
-
Pain after significant trauma
-
Sudden and marked loss of strength
-
Persistent numbness in arm and hand
-
Pain with fever, chills, redness, or intense heat
-
History of cancer
Lack of Response to Treatment:
-
No improvement after 12 weeks of physical therapy
-
Progressive worsening despite treatment
The longer you wait, the more likely the syndrome is to become chronic. If you are unsure, consult your doctor.
To explore all treatment options, check out our comprehensive guide to shoulder pain.
References
-
Bigliani LU, Morrison DS, April EW. The morphology of the acromion and its relationship to rotator cuff tears. Orthop Trans. 1986;10:228.
-
Michener LA, McClure PW, Karduna AR. Anatomical and biomechanical mechanisms of subacromial impingement syndrome. Clin Biomech (Bristol, Avon). 2003;18(5):369-379. doi:10.1016/s0268-0033(03)00047-0
-
Ludewig PM, Reynolds JF. The association of scapular kinematics and glenohumeral joint pathologies. J Orthop Sports Phys Ther. 2009;39(2):90-104. doi:10.2519/jospt.2009.2808
-
Tyler TF, Nicholas SJ, Roy T, Gleim GW. Quantification of posterior capsule tightness and motion loss in patients with shoulder impingement. Am J Sports Med. 2000;28(5):668-673. doi:10.1177/03635465000280050801
-
Thigpen CA, Padua DA, Michener LA, et al. Head and shoulder posture affect scapular mechanics and muscle activity in overhead tasks. J Electromyogr Kinesiol. 2010;20(4):701-709. doi:10.1016/j.jelekin.2009.12.003
.jpg)
.jpg)
%20(1).jpg)
