Pain Sensitization Mechanisms in Osteoarthritis
Summary
Osteoarthritis pain arises from a dynamic interplay of peripheral and central processes that amplify nociceptive signalling beyond the extent of joint damage alone. At the periphery, local inflammation, subchondral bone remodelling and nerve growth factor–driven neurite sprouting in the synovium and periosteum lower the activation threshold of nociceptors. This peripheral sensitization yields primary hyperalgesia at the affected joint. Concurrently, ongoing afferent input drives neuroplastic changes in the spinal dorsal horn and brainstem, reducing inhibitory control and enhancing excitatory transmission, thereby producing central sensitization. Aberrant functioning of descending modulatory pathways, including diminished endogenous inhibition and increased facilitation via brainstem centres such as the rostral ventromedial medulla, further perpetuates widespread pain sensitivity. Together, these mechanisms contribute to features of neuropathic-like pain, pain spread beyond the index joint and variability in treatment response. Recognition of distinct sensitization phenotypes is informing stratified approaches to pain management, ranging from peripherally targeted anti-inflammatory or anti-nerve-growth-factor therapies to central interventions such as cognitive-behavioural techniques and neuromodulation.
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Pain Sensitization Mechanisms in Osteoarthritis publication trend
The graph below shows the total number of articles in pain sensitization mechanisms in osteoarthritis across all publications each year (not limited to Nature Index journals).
Technical terms
Peripheral sensitization: Increased responsiveness of nociceptors in joint tissues due to inflammatory mediators and nerve growth factor.
Central sensitization: Amplification of pain signals within the spinal dorsal horn and brainstem, leading to heightened pain perception and spread beyond the injury site.
Quantitative sensory testing (QST): Battery of psychophysical assessments measuring mechanical and thermal pain thresholds and modulatory capacity.
Descending pain modulation: Brainstem-mediated pathways that normally inhibit or facilitate spinal nociceptive transmission.
Hyperalgesia: Increased pain response to a stimulus that is normally painful, reflecting sensitization of the nervous system.
References
- Central Sensitization in Knee Osteoarthritis: Relating Presurgical Brainstem Neuroimaging and PainDETECT‐Based Patient Stratification to Arthroplasty Outcome. Arthritis & Rheumatology (2019).
- Subjects with Knee Osteoarthritis Exhibit Widespread Hyperalgesia to Pressure and Cold. PLOS ONE (2016).
- Quantitative Sensory Testing Across Chronic Pain Conditions and Use in Special Populations. Frontiers in Pain Research (2022).
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