{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,11,3]],"date-time":"2026-11-03T17:45:04Z","timestamp":1793727904495,"version":"4.6.1"},"reference-count":49,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2022,4,18]],"date-time":"2022-04-18T00:00:00Z","timestamp":1650240000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100000738","name":"United States Department of Veterans Affairs","doi-asserted-by":"publisher","award":["I01RX002604"],"award-info":[{"award-number":["I01RX002604"]}],"id":[{"id":"10.13039\/100000738","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100000738","name":"United States Department of Veterans Affairs","doi-asserted-by":"publisher","award":["I01CX001388"],"award-info":[{"award-number":["I01CX001388"]}],"id":[{"id":"10.13039\/100000738","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100000002","name":"National Institutes of Health","doi-asserted-by":"publisher","award":["R01AR075825"],"award-info":[{"award-number":["R01AR075825"]}],"id":[{"id":"10.13039\/100000002","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100000002","name":"National Institutes of Health","doi-asserted-by":"publisher","award":["R01AR062581"],"award-info":[{"award-number":["R01AR062581"]}],"id":[{"id":"10.13039\/100000002","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100000002","name":"National Institutes of Health","doi-asserted-by":"publisher","award":["R01AR078877"],"award-info":[{"award-number":["R01AR078877"]}],"id":[{"id":"10.13039\/100000002","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100000002","name":"National Institutes of Health","doi-asserted-by":"publisher","award":["R21AR075851"],"award-info":[{"award-number":["R21AR075851"]}],"id":[{"id":"10.13039\/100000002","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100000002","name":"National Institutes of Health","doi-asserted-by":"publisher","award":["R01AR068987"],"award-info":[{"award-number":["R01AR068987"]}],"id":[{"id":"10.13039\/100000002","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100000002","name":"National Institutes of Health","doi-asserted-by":"publisher","award":["T32EB005970"],"award-info":[{"award-number":["T32EB005970"]}],"id":[{"id":"10.13039\/100000002","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100006775","name":"GE Healthcare","doi-asserted-by":"publisher","award":["N\/A"],"award-info":[{"award-number":["N\/A"]}],"id":[{"id":"10.13039\/100006775","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["www.mdpi.com"],"crossmark-restriction":true},"short-container-title":["IJMS"],"abstract":"<jats:p>A relationship between an acidic pH in the joints, osteoarthritis (OA), and pain has been previously demonstrated. Acidosis Chemical Exchange Saturation Transfer (acidoCEST) indirectly measures the extracellular pH through the assessment of the exchange of protons between amide groups on iodinated contrast agents and bulk water. It is possible to estimate the extracellular pH in the osteoarthritic joint using acidoCEST MRI. However, conventional MR sequences cannot image deep layers of cartilage, meniscus, ligaments, and other musculoskeletal tissues that present with short echo time and fast signal decay. Ultrashort echo time (UTE) MRI, on the other hand, has been used successfully to image those joint tissues. Here, our goal is to compare the pH measured in the knee joints of volunteers without OA and patients with severe OA using acidoCEST-UTE MRI. Patients without knee OA and patients with severe OA were examined using acidoCEST-UTE MRI and the mean pH of cartilage, meniscus, and fluid was calculated. Additionally, the relationship between the pH measurements and the Knee Injury and Osteoarthritis Outcome Score (KOOS) was investigated. AcidoCEST-UTE MRI can detect significant differences in the pH of knee cartilage, meniscus, and fluid between joints without and with OA, with OA showing lower pH values. In addition, symptoms and knee-joint function become worse at lower pH measurements.<\/jats:p>","DOI":"10.3390\/ijms23084466","type":"journal-article","created":{"date-parts":[[2022,4,18]],"date-time":"2022-04-18T22:04:02Z","timestamp":1650319442000},"page":"4466","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":48,"title":["AcidoCEST-UTE MRI Reveals an Acidic Microenvironment in Knee Osteoarthritis"],"prefix":"10.3390","volume":"23","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6820-1779","authenticated-orcid":false,"given":"Alecio","family":"Lombardi","sequence":"first","affiliation":[{"name":"Research Service, Veterans Affairs San Diego Healthcare System, San Diego, CA 92161, USA"},{"name":"Department of Radiology, University of California San Diego, San Diego, CA 92161, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yajun","family":"Ma","sequence":"additional","affiliation":[{"name":"Department of Radiology, University of California San Diego, San Diego, CA 92161, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hyungseok","family":"Jang","sequence":"additional","affiliation":[{"name":"Department of Radiology, University of California San Diego, San Diego, CA 92161, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6450-2892","authenticated-orcid":false,"given":"Saeed","family":"Jerban","sequence":"additional","affiliation":[{"name":"Department of Radiology, University of California San Diego, San Diego, CA 92161, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qingbo","family":"Tang","sequence":"additional","affiliation":[{"name":"Research Service, Veterans Affairs San Diego Healthcare System, San Diego, CA 92161, USA"},{"name":"Department of Radiology, University of California San Diego, San Diego, CA 92161, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1084-2415","authenticated-orcid":false,"given":"Adam","family":"Searleman","sequence":"additional","affiliation":[{"name":"Department of Radiology, University of California San Diego, San Diego, CA 92161, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Robert","family":"Meyer","sequence":"additional","affiliation":[{"name":"Orthopaedic Surgery Service, Veterans Affairs San Diego Healthcare System, San Diego, CA 92161, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jiang","family":"Du","sequence":"additional","affiliation":[{"name":"Department of Radiology, University of California San Diego, San Diego, CA 92161, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3633-5630","authenticated-orcid":false,"given":"Eric","family":"Chang","sequence":"additional","affiliation":[{"name":"Research Service, Veterans Affairs San Diego Healthcare System, San Diego, CA 92161, USA"},{"name":"Department of Radiology, University of California San Diego, San Diego, CA 92161, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2022,4,18]]},"reference":[{"key":"ref_1","unstructured":"GBD 2017 Disease and Injury Incidence and Prevalence Collaborators (2018). 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