Anatomy and Functions of Supraspinatus Tendon
The supraspinatus tendon is one of the four tendons that form the rotator cuff of the shoulder and is the continuation of the supraspinatus muscle. The supraspinatus muscle originates from the supraspinous fossa, a shallow depression on the upper part of the scapula (shoulder blade), and its tendon passes beneath the acromion through the subacromial space before attaching to the superior facet of the greater tubercle of the humerus (upper arm bone). This anatomical position makes the tendon particularly vulnerable to friction and impingement during repetitive overhead movements. Functionally, the supraspinatus tendon plays a crucial role in initiating the first 15 degrees of shoulder abduction, which is the movement of raising the arm away from the body. It also works together with the other rotator cuff muscles to stabilize the head of the humerus within the glenoid cavity of the shoulder joint during arm movements. By maintaining shoulder stability and assisting the deltoid muscle, the supraspinatus tendon enables smooth, coordinated, and powerful movements required for everyday activities such as lifting, reaching overhead, throwing, and carrying objects.
What is Supraspinatus Tendonitis?
Supraspinatus tendonitis is a common shoulder disorder in which the supraspinatus tendon becomes irritated or inflamed, leading to pain, reduced shoulder movement, and weakness, especially during overhead activities.
Common Symptoms:
Pain on the top or outer side of the shoulder.
Pain when lifting the arm overhead.
Discomfort while reaching behind the back.
Night pain, especially when lying on the affected shoulder.
Weakness during arm elevation or rotation.
Special Tests and Self-Tests for Supraspinatus Tendonitis
Several clinical tests can help identify irritation or injury of the supraspinatus tendon. While these tests may suggest supraspinatus tendonitis, they do not replace a professional medical examination or imaging when necessary.
1. Jobe's Test (Empty Can Test)
The Empty Can Test is one of the most commonly used special tests for supraspinatus tendon pathology.
How to perform:
- Raise your arms to about 90° in front of you at a 30° angle from the body.
- Turn your thumbs downward, as if emptying a can.
- Have someone gently push your arms downward while you resist.
Positive test:
- Pain on the top or outer part of the shoulder.
- Weakness while resisting the downward pressure.
This may indicate supraspinatus tendonitis or a supraspinatus tendon tear.
2. Full Can Test
This test is similar to the Empty Can Test but places less stress on the shoulder.
How to perform:
- Raise your arm to 90° with the thumb pointing upward.
- Resist gentle downward pressure.
Positive test:
- Shoulder pain or weakness.
3. Hawkins-Kennedy Test
This test helps detect shoulder impingement, which commonly accompanies supraspinatus tendonitis.
How to perform:
- Raise your arm forward to 90°.
- Bend the elbow to 90°.
- Rotate the arm inward.
Positive test:
- Sharp pain in the front or outer shoulder.
4. Painful Arc Test
This is a simple self-test that may indicate supraspinatus tendon irritation.
How to perform:
- Slowly lift your arm sideways from your body.
Positive test:
- Pain between approximately 60° and 120° of arm elevation.
- Pain decreases after lifting above this range.
5. Drop Arm Test
This test helps detect significant weakness or a possible rotator cuff tear.
How to perform:
- Raise your arm fully to the side.
- Slowly lower it back down.
Positive test:
- Inability to control the movement.
- Sudden dropping of the arm.
- Severe weakness or pain.
When to seek medical evaluation
- Sudden severe weakness after an injury.
- Inability to raise the arm.
- Significant swelling, redness, or fever.
- Numbness, tingling, or neck-related symptoms.
Why to Choose Physiotherapy for Supraspinatus Tendonitis Treatment
- Reducing pain and inflammation.
- Restoring shoulder mobility.Improving rotator cuff strength.
- Correcting scapular (shoulder blade) mechanics.
- Gradually returning the tendon to normal load.
What Procedures a Physiotherapist Do?
- Manual therapy for shoulder and thoracic mobility.
- Electrotherapy such as TENS, UST, Soft Wave, LASER, etc.
- Soft tissue techniques.Taping when appropriate.
- Education about activity modification and ergonomics.
- Progressive loading programs tailored to your goals.
- A physiotherapist will advice you to do exercises.
Phase 1: Pain Relief and Protection (Week 1-2)
Relative rest
- Avoid painful overhead lifting.
- Reduce repetitive reaching and heavy carrying.
- Continue gentle daily activities within a comfortable range.
Ice therapy
- Apply ice for 15-20 minutes after aggravating activities.
- Use a cloth barrier to protect the skin.
Posture correction
- Keep the shoulders relaxed and slightly back.
- Avoid prolonged slouched sitting.
- Consider adjusting workstation height and screen position.
Pendulum exercise
- Lean forward and let the affected arm hang.
- Gently sway the body to create small circles.
- Perform 30-60 seconds in each direction.
Phase 2: Restore Mobility (Week 2-4)
Wall slides
- Place the forearms on a wall.
- Slide upward slowly as tolerated.
- Return slowly.Perform 10-15 repetitions.
Assisted shoulder flexion
- Use a stick, towel, or the opposite hand.
- Gently help the affected arm move overhead.
- Stop before sharp pain occurs.
Cross-body stretch
- Bring the arm across the chest.
- Hold for 20-30 seconds.
- Repeat 3-5 times
Posterior shoulder stretch
- Gently stretch the back of the shoulder if it feels tight.
- Avoid forcing the movement.
Phase 3: Strengthen the Rotator Cuff (Week 3-8)
Isometric shoulder abduction
- Stand with the arm at your side.
- Press the arm outward into a wall or pillow without moving it.
- Hold for 5-10 seconds.
- Repeat 10 times.
External rotation with a resistance band
- Keep the elbow tucked against the body.
- Rotate the forearm outward.
- Return slowly.
- Perform 2-3 sets of 10-15 repetitions.
Scapular retraction
- Squeeze the shoulder blades together.
- Hold for 3-5 seconds.
- Repeat 15 times.
Phase 4: Return to Full Activity (Week 6-12+)
For athletes and overhead workers
- Begin with low-intensity practice.
- Increase volume before increasing intensity.
- Monitor for next-day soreness.
- Continue rotator cuff and scapular exercises 2-3 times per week for maintenance.
What to Avoid During Recovery
- Pushing through sharp pain.
- Suddenly returning to heavy overhead exercise.
- Excessive corticosteroid injections without proper evaluation.
- Ignoring persistent weakness or loss of function.
Frequently Asked Questions
How long does recovery take?
Mild cases may improve within 2-6 weeks. Moderate tendinopathy often requires 6-12 weeks of consistent rehabilitation. Long-standing or recurrent cases can take several months to fully settle.
Is supraspinatus tendonitis the same as a rotator cuff tear?
No. Tendonitis or tendinopathy refers to irritation or degeneration of the tendon. A tear means the tendon fibers have partially or completely disrupted. Persistent weakness, traumatic injury, or failure to improve may warrant imaging to rule out a tear.
Should I completely rest my shoulder?
Usually no. Relative rest is preferred. Avoid activities that aggravate symptoms while maintaining gentle movement and prescribed exercises.
Can I continue exercising?
Often yes, with modifications. Lower-body exercise, walking, cycling, and pain-free upper-body movements are usually acceptable. Avoid exercises that provoke significant shoulder pain.
Will I need surgery?
Most people do not need surgery. Evidence suggests that comprehensive conservative management, especially physiotherapy, is effective for the majority of patients.
Is sleeping on the affected side harmful?
It often increases pain. Try sleeping on the opposite side with a pillow supporting the affected arm, or sleep on your back with the arm supported.
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