Sensory processing and central pain modulation in patients with chronic shoulder pain: A case-control study

Area of Science:

• Neuroscience
• Pain Research
• Musculoskeletal Health

Background:

• Chronic musculoskeletal shoulder pain is common and may involve central sensitization.
• Previous studies suggest central sensitization but lack comprehensive quantitative sensory testing (QST) protocols.

Purpose of the Study:

• To investigate sensory processing and central pain modulation in chronic shoulder pain patients using a detailed QST protocol.
• To compare QST measures between chronic shoulder pain patients and healthy controls.

Main Methods:

• A comprehensive, standardized QST protocol was applied to 50 participants (patients and controls).
• Testing included static measures (pressure, vibration, mechanical detection) and dynamic measures (temporal summation, conditioned pain modulation).
• Psychosocial factors were assessed via questionnaires.

Main Results:

• No significant differences were observed between patients and controls in any QST measure.
• Moderate positive correlations were found between pressure pain thresholds and sports participation.
• Weak-to-moderate negative correlations linked pressure pain thresholds to pain catastrophizing.

Conclusions:

• Central sensitization is not a defining characteristic of chronic musculoskeletal shoulder pain.
• While not a general feature, central sensitization may be present in some individual cases.
• Psychosocial factors and physical activity levels correlate with pain sensitivity in shoulder pain patients.