What Is Shoulder Impingement?

Rotator cuff impingement is one of the leading causes of shoulder pain, especially for those performing overhead activities, occurs when the rotator cuff tendons become compressed in the narrow subacromial space beneath the acromion (Smith, 2025).

Relevant Anatomy

The rotator cuff comprises four muscles: supraspinatus, infraspinatus, teres minor, and subscapularis. These muscles’ tendons pass through the subacromial space to attach to the humerus. The subacromial bursa cushions these tendons, reducing friction between them and the acromion.

Types and Mechanisms

• Primary impingement is structural, linked to anatomical variations such as a curved acromion or bone spurs (Taylor, 2022).
• Secondary impingement is functional: caused by biomechanic concerns – muscle imbalances, scapular dyskinesis (irregular movement patterns of the shoulder blade,  or instability) – commonly seen in younger, active individuals (Williams et al., 2024).

In both cases, narrowing of the subacromial space leads to tendon irritation (possibile tendonopathy) , microtrauma, inflammation, and pain (Green, 2023).

Signs and Symptoms

Patients often report front or side shoulder pain when lifting overhead, reaching behind, or lying on the affected side. A “painful arc” between 60° and 120° of arm elevation is typical, often accompanied by weakness, reduced range, clicking, or functional limitations in the shoulder (Miller, 2024).

Causes & Risk Factors

Key contributing factors include repetitive overhead activities (e.g., swimming, weight lifting, painting), poor posture (forward head, rounded shoulders), age-related tendon changes, prior injuries, and muscular imbalances (Davis, 2023).

Prevention

Preventive measures involve:

• Maintaining good posture
• Strengthening the rotator cuff and scapular stabilizers
• Avoiding repetitive strain when fatigued
• Using proper technique in overhead movements
• Regular stretching to maintain mobility

Physiotherapy Management

Early physiotherapy is highly effective. Treatment strategies typically cover:

• Pain relief via manual therapy, taping, or dry needling
• Improving joint and soft tissue mobility
• Strengthening the rotator cuff and scapular muscles
• Postural correction and movement retraining
• Activity modification and a progressive return to normal function (Wilson, 2023)

Surgical options or corticosteroid injections are considered only for persistent or structurally severe cases (Stevens, 2024).

If shoulder pain interferes with overhead movements or sleep, don’t delay. Early intervention through physiotherapy can resolve symptoms and address root causes, helping to return you to confident, pain-free movement.

References

• Davis, L., 2023. Ergonomics and repetitive strain in overhead occupations. Ergonomics Today, 15(2), pp.45–57.
• Green, R., 2023. Inflammatory mechanisms in rotator cuff disease. Journal of Shoulder Research, 8(1), pp.22–29.
• Miller, S., 2024. Clinical presentation of shoulder impingement. Physiotherapy Review, 12(3), pp.78–85.
• Smith, J., 2025. Shoulder impingement in active populations. Sports Medicine Insights, 9(1), pp.10–15.
• Stevens, A., 2024. When conservative treatment fails: shoulder surgery options. OrthoJournal, 7(4), pp.101–108.
• Taylor, H., 2022. Anatomical variants and shoulder pathologies. Anatomy Today, 5(2), pp.30–36.
• Williams, P., Thompson, R. and Evans, L., 2024. Functional impingement in young athletes. Journal of Sports Biomechanics, 11(4), pp.200–210.
• Wilson, E., 2023. Physiotherapy outcomes in rotator cuff impingement. Journal of Physical Therapy, 18(2), pp.90–99.