{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,23]],"date-time":"2026-08-23T15:18:51Z","timestamp":1787498331912,"version":"build-2736575974"},"reference-count":78,"publisher":"Ovid Technologies (Wolters Kluwer Health)","issue":"4","content-domain":{"domain":["lww.com","ovid.com"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2022,7]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>Pain, a physiological protective mechanism, turns into a complex dynamic neural response when it becomes chronic. The role of neuroplastic brain changes is more evident than the peripheral factors in the maintenance, modulation and amplification of chronic low back pain (cLBP). In this background, we summarise the brain changes in cLBP in a coordinate-based activation likelihood estimation (ALE) meta-analysis of previous functional magnetic resonance imaging (fMRI) studies. Databases ('PubMed', 'Scopus' and 'Sleuth') were searched till May 2022 and the activity pattern was noted under the 'without stimulation' and 'with stimulation' groups. A total of 312 studies were selected after removing duplicates. Seventeen (553 cLBP patients, 192 activation foci) studies were fulfilled the eligibility criteria and included in the 'without stimulation' group. Twelve statistically significant clusters are localized in the prefrontal cortex, primary somatosensory cortex, primary motor cortex, parietal cortex, anterior cingulate cortex, caudate, putamen, globus pallidus amygdala, occipital lobe, temporal lobe and associated white matter in this group. Ten studies (353 cLBP patients, 125 activation foci) were selected in the' with stimulation' groups. In this group, seven statistically significant clusters were found in the frontal cortex, orbitofrontal cortex, premotor cortex, parietal cortex, claustrum and insula. These statistically significant clusters indicate a probable imbalance in GABAergic modulation of brain circuits and dysfunction in the descending pain modulation system. This disparity in the pain neuro-matrix is the source of spontaneous and persisting pain in cLBP.<\/jats:p>","DOI":"10.4103\/0028-3886.355137","type":"journal-article","created":{"date-parts":[[2022,9,26]],"date-time":"2022-09-26T00:36:16Z","timestamp":1664152576000},"page":"1344-1360","update-policy":"https:\/\/doi.org\/10.1097\/lww.0000000000001000","source":"Crossref","is-referenced-by-count":8,"title":["A Dysfunctional Descending Pain Modulation System in Chronic Nonspecific Low Back Pain: A Systematic Review and ALE Meta-Analysis"],"prefix":"10.4103","volume":"70","author":[{"given":"Sandipan","family":"Hazra","sequence":"first","affiliation":[{"name":"Department of Physical Medicine and Rehabilitation, R. G. Kar Medical College, Kolkata, West Bengal, India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gita","family":"Handa","sequence":"additional","affiliation":[{"name":"Department of Physical Medicine and Rehabilitation, All India Institute of Medical Sciences, New Delhi, India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Prasunpriya","family":"Nayak","sequence":"additional","affiliation":[{"name":"Department of Physiology, All India Institute of Medical Sciences, Jodhpur, Rajasthan, India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Samantak","family":"Sahu","sequence":"additional","affiliation":[{"name":"Department of Physical Medicine and Rehabilitation, All India Institute of Medical Sciences, Jodhpur, Rajasthan, India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kaushik","family":"Sarkar","sequence":"additional","affiliation":[{"name":"Department of Electronics and Communication Engineering, Narula Institute of Technology, Kolkata, West Bengal, India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Srikumar","family":"Venkataraman","sequence":"additional","affiliation":[{"name":"Department of Physical Medicine and Rehabilitation, All India Institute of Medical Sciences, New Delhi, India"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"276","published-online":{"date-parts":[[2022,8,30]]},"reference":[{"key":"R1-20250921","doi-asserted-by":"crossref","first-page":"971","DOI":"10.1126\/science.150.3699.971","article-title":"Pain mechanisms: A new theory","volume":"150","author":"Melzack","year":"1965","journal-title":"Science"},{"key":"R2-20250921","doi-asserted-by":"crossref","first-page":"71","DOI":"10.1038\/nrn2042","article-title":"Ideas about pain, a historical view","volume":"8","author":"Perl","year":"2007","journal-title":"Nat Rev Neurosci"},{"key":"R3-20250921","doi-asserted-by":"crossref","first-page":"427","DOI":"10.1097\/00007632-199702150-00015","article-title":"Spinal radiographic findings and nonspecific low back pain. 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