ArticleArthritis research & therapy2025
The impact of MRI slice thickness on the detection of spinal syndesmophytes in axial spondyloarthritis.
Article in Arthritis research & therapy, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundRadiography is commonly used in clinical practice for detecting syndesmophytes in radiographic axial Spondyloarthritis (r-axSpA), while the ability of magnetic resonance imaging (MRI) to detect such bony structures is questionable due to its slicing technique. We aimed to assess the ability and performance for detection of syndesmophytes on MRI using different slice thicknesses and compare them with radiography in r-axSpA.
methodsMRI (T1-weighted (T1W) sequences) with slice thicknesses of 1-6 mm of the lower thoracic and lumbar spine were prospectively performed in patients with available radiographs. Each vertebral corner (VC) (anterior and posterior) from thoracic (Th11) to lumbar (L5) was assessed for presence/absence of syndesmophytes and/or fat lesions (FL, MRI only) by two experienced readers in independent MRI and radiography sessions and agreement was then reached in consensus.
resultsA total of 1.204 VCs were assessed from 43 r-axSpA patients. Syndesmophytes were recorded in 19.3% VCs on radiography and in 38.3%, 37.5%, 34.8%, 33.7%, 31.4%, 28.7% VCs on MRI slice thicknesses of 1-6 mm, respectively (all p ≤ 0.001 vs. radiography). Although more syndesmophytes were recorded on MRI than radiography, MRI also missed 21%-31.3% syndesmophytes detected in radiography. Agreement with radiography was found in 72.6%, 73.8%, 75.9%, 76%, 77.3% and 78.5% on MRI slice thicknesses of 1-6 mm, respectively. FL were detected in 38.2%-39.2% in slice thicknesses 1-6 mm. Occurrence of FL was associated with better agreement between MRI and radiography findings.
conclusionThe thinner the MRI slices, the more syndesmophytes were detected compared to radiography, but the best agreement with radiography was found in the thicker slices. The presence of fat lesions on MRI was associated with better agreement with radiography for syndesmophyte detection.
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