《Chinese Journal of Rehabilitation Theory and Practice》 ›› 2022, Vol. 28 ›› Issue (5): 602-608.doi: 10.3969/j.issn.1006-9771.2022.05.016

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Characteristics of amplitude of low frequency fluctuation in patients with knee osteoarthritis and low back pain

CAI Guiyan1,CHEN Ruilin1,XU Shurui1,TAO Jing1,2,3,4(),LIU Jiao1,2,3,4()   

  1. 1. College of Rehabilitation Medicine, Fujian University of Traditional Chinese Medicine, Fuzhou, Fujian 350122, China
    2. Fujian Key Laboratory of Rehabilitation Technology, Fuzhou, Fujian 350122, China
    3. Academy of Rehabilitation Industry, Fujian University of Traditional Chinese Medicine, Fuzhou, Fujian 350122, China
    4. Key Laboratory of Orthopedics & Traumatology of Traditional Chinese Medicine and Exercise Rehabilitation, Ministry of Education, Fuzhou, Fujian 350122, China
  • Received:2022-01-11 Revised:2022-04-05 Published:2022-05-25 Online:2022-06-10
  • Contact: TAO Jing,LIU Jiao E-mail:taojing01@163.com;liujiao0415@outlook.com
  • Supported by:
    Fujian University of Traditional Chinese Medicine of Fujian Rehabilitation Tech Co-Innovation Center Project (X2021001-Collaboration)

Abstract:

Objective To compare the brain imaging characteristics in patients with knee osteoarthritis (KOA) and low back pain (LBP) based on amplitude of low frequency fluctuation (ALFF) of functional magnetic resonance imaging. Methods From August, 2015 to September, 2021, 16 KOA patients and 16 healthy subjects (controls 1) with similar age and gender were recruited from the communities of Fuzhou, Fujian. Other 27 patients with LBP and 32 healthy subjects (controls 2) with similar age and gender were obtained from the Openpain database. The ALFF were analyzed. KOA patients were assessed the pain with Brief Pain Inventory (BPI), and LBP patients were assessed with Visual Analogue Scale (VAS). The correlation between ALFF and pain scores was analyzed. Results Compared with their own controls, the ALFF decreased in the left anterior insula for both KOA and LBP patients. The ALFF decreased in the hippocampus and posterior cingulate cortex in KOA patients, while increased in LBP patients. ALFF in the left precuneus, left middle cingulate cortex and right periaqueductal gray matter decreased in KOA patients, and ALFF increased in the right precentral/postcentral gyrus. ALFF of bilateral anterior cingulate cortex, bilateral orbital anterior frontal cortex, left dorsolateral prefrontal cortex and right medial prefrontal cortex decreased in LBP patients, and ALFF increased in the right parahippocampal gyrus and right amygdala. ALFF of the left middle cingulate cortex negatively correlated with BPI score in KOA patients (r = -0.73, P = 0.003), and ALFF of the right hippocampus/amygdala positively correlated with VAS score in LBP patients (r = 0.73, P = 0.003). Conclusion There are common and specific brain imaging features in different types of chronic pain. The alteration in the left anterior insula, hippocampus and posterior cingulate gyrus may be the common mechanism for KOA and LBP.

Key words: knee osteoarthritis, low back pain, chronic pain, functional magnetic resonance imaging, amplitude of low frequency fluctuation

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