Musculoskeletal Pain in Long COVID

Long COVID is defined as signs and symptoms that develop during or after an infection consistent with COVID-19, continue for more than four weeks and are not explained by an alternative diagnosis. It has been estimated there are 2 million people in the UK alone with long COVID symptoms. Most people with long COVID experience some limitation to their daily activities. This causes new challenges to the patients and their families as well as to the healthcare system. Musculoskeletal (MSK) pain is one of the most common reported symptoms in long COVID. The causes and underlying mechanisms of MSK pain in long COVID are not fully understood yet. A few underlying mechanisms have been hypothesised to cause the pain including detrimental impacts of the virus on neurological functions and central nervous system; immunologic aberrations and inflammatory damage in response to the acute infection; expected sequelae of post-critical illness involving deconditioning process following a period of inactivity, bed rest or sedentary lifestyle associated with the viral infection. The purpose of this study is to investigate the clinical characteristics, etiopathological mechanisms and the natural course of pain, and to understand its physical and psychosocial consequences. We will also analyse the correlation of pain to clusters of long COVID symptoms. We anticipate the results of this study will help the healthcare providers to deliver adequate management for patients with long COVID. This is a longitudinal study to observe 100 patients with long COVID pain throughout an 18-month period. Pain assessment will be undertaken using validated methods, that include blood tests to detect inflammatory biomarkers, clinical examination, standardised pain instruments/scales, Quantitative Sensory Testing to measure changes in sensitivity, and electroencephalography to measure brain network activity. Physical activity measurements include Timed Up and Go Test to assess balance and mobility, Rated Perceived Exertion Scale to measure exercise intensity, and Hand-Grip Dynamometer test to measure handgrip strength. In addition, we will use psychological assessment tools to assess the severity of depression and anxiety, and self-efficacy and pain-related thoughts.