Experimental Pain Model Based on Short-Wave Diathermy Replicates the Intensity, Quality and Spatial Distribution of...

Area of Science:

• Pain research
• Experimental models of pain
• Shoulder pain mechanisms

Background:

• Existing experimental shoulder pain models often fail to replicate clinical pain characteristics.
• Accurate models are crucial for understanding and treating shoulder pain effectively.

Purpose of the Study:

• To evaluate if short-wave diathermy (SWD) can serve as a valid experimental model for clinical shoulder pain.
• To compare pain intensity, quality, and spatial distribution between SWD-induced pain and unilateral shoulder pain (USP).

Main Methods:

• Thirty-two healthy volunteers received SWD to induce experimental shoulder pain.
• Thirty-two patients with USP were assessed.
• Pain intensity (VAS), quality (McGill Pain Questionnaire), pressure pain thresholds (PPTs), and spatial distribution were measured in both groups.

Main Results:

• SWD-induced pain showed statistically equivalent pain intensity (±2 VAS points) and spatial distribution compared to USP.
• Both groups described pain as continuous, well-delimited, dull, and bearable.
• USP patients reported more stabbing/nagging pain, while SWD volunteers reported hot/heavy sensations.

Conclusions:

• Experimental shoulder pain induced by SWD accurately reproduces key characteristics of clinical unilateral shoulder pain.
• SWD is a promising model for studying shoulder pain mechanisms and testing interventions.