Sensory Characteristics and Psychosocial Factors Related With Non-specific Neck Musculoskeletal Pain Chronification

Chronic pain is commonly defined as any pain which lasts more than 12 weeks. Chronic non-specific neck pain (CNSNP) has no specific underlying disease causing the pain. There are neurophysiological factors that may modulate pain response and perception in the central nervous system, producing sensory changes such as the presence of temporal summation (TS) and pressure, cold or heat hyperalgesia. TS describes the progressive increase in reported pain intensity as a function of repeated noxious stimulation (e.g. thermal, electrical or mechanical). TS and hyperalgesia are measured through quantitative sensory tests (QST) where pain pressure thresholds (PPT) are measured with an algometer. The current evidence show that PPTs are significantly lower compared to healthy subjects and the association between PPTs, pain intensity and disability are inconsistent. Further, there are psychosocial factors (catastrophizing, kinesiophobia, stress...) that may influence the pain experience. This psychosocial factors associated with chronic pain are not systematically collected in the QST literature complicating the interpretation of data. The objectives of this study are 1) to determine disability, sensory (TS and PPTs) and psychosocial changes (kinesiophobia, catastrophizing, sleep quality, life quality, stress and anxiety) in the natural evolution or in the result of physiotherapy treatment in CNSNP individuals, 2) to study the correlations between disability, psychosocial and sensory factors and 3) to observe if there is a homogeneity between the subjects.