May 2025
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IntroductionNociplastic pain is an important mechanistic pain descriptor that plays a significant role in influencing reported pain intensity and complicating outcome assessment in inflammatory arthropathies (IA). This pain is not driven by inflamed joints but is instead driven by the functional reorganisation of the central nervous system. Although several defining criteria for nociplastic pain have been proposed in literature there is paucity of validated and agreed comprehensive instrument to identify or measure this pain.Pain of IA differs from that seen in archetypical nociplastic condition -primary fibromyalgia due to the encompassing elements of nociceptive joint inflammation and additional pain of secondary fibromyalgia in a cross section of patients. However, the exact chronology for transition of nociceptive to mixed pain state in these patients is yet unknown. Therefore, identifying a validated instrument to measure this potential confounder in rheumatological studies will improve interpretation of study results in rheumatology and future pain management in Rheumatic Musculoskeletal Diseases (RMD’s). MethodsA scoping review protocol will be developed and all instruments assessing nociplastic pain will be systematically reviewed. Individual items in each instrument with potential to identify nociplastic pain in patients with RMDs using the OMERACT Filter 2.2 methodology will also be collated. Relevant associated central symptoms including mood, fatigue, sleep, and cognition will be noted. Conclusion Following development of an agreed protocol the scoping review will be developed. Preliminary report of the scoping review will provide basis for an initial feedback from OMERACT 2025 participants including patient partners. This work contributes towards ongoing research in this space. Keywords: OMERACT, nociplastic pain, inflammatory arthritis, contextual factorsHIGHLIGHTS•Nociplastic pain is a newly defined term to describe persistent pain that is mechanistically neither nociceptive nor neuropathic and is often described as secondary fibromyalgia or non inflammatory pain in IA’s.•Nociplastic pain is a potential confounder in rheumatological research and therefore developing agreed validated measurement tools is paramount. •A scoping review will be undertaken following development of this protocol to identify currently used instruments and items within instruments. The domains from the identified instruments and items which map on to the defined parameters of nociplastic pain will be described.