Reliable semiquantitative whole-joint MRI score for the shoulder joint: The shoulder osteoarthritis severity (SOAS) score.

Jungmann, Pia M; Gersing, Alexandra S; Woertler, Klaus; Dietrich, Tobias J; Baum, Thomas; Baumann, Frederic; Bensler, Susanne

doi:10.1002/jmri.26251

journal article

Document type:: Journal Article
Author(s):: Jungmann, Pia M; Gersing, Alexandra S; Woertler, Klaus; Dietrich, Tobias J; Baum, Thomas; Baumann, Frederic; Bensler, Susanne
Title:: Reliable semiquantitative whole-joint MRI score for the shoulder joint: The shoulder osteoarthritis severity (SOAS) score.
Abstract:: BACKGROUND: Shoulder osteoarthritis causes severe pain and functional disability. Preventive surgical procedures aiming to halt the progression of degenerative changes are increasingly applied. However, no MRI-based score exists that may be applied for scoring of osteoarthritic changes and their progression. PURPOSE: To establish a semiquantitative MRI-based shoulder osteoarthritis severity (SOAS) evaluation system and to test its reliability. STUDY TYPE: Retrospective. SUBJECTS: A total of N = 60 patients (73.2 ± 7.3 years; 30/60 female) was included; n = 15 subjects for each of the four radiographic grades of osteoarthritis (Samilson score 0 to 3). ASSESSMENT: Based on the MRIs of the shoulder, the SOAS scoring system was created. All MRIs were assessed by six readers. The severity of degeneration was evaluated for: rotator cuff, labral-bicipital-complex, cartilage, osseous findings, joint capsule, and acromion. The total SOAS score ranged between 0 (absence of osteoarthritis) and 100 (most severe osteoarthritis). SOAS scores were correlated with radiographic Samilson, Hamada and Kellgren-Lawrence (KL) gradings. STATISTICS: Pearson correlations, t-tests, receiver operating characteristics (ROC) and interclass correlation coefficients (ICC). RESULTS: Intra- (ICC = 0.99) and interreader agreement (ICC 0.96-0.98) for the total SOAS score was excellent. The range of SOAS scores was from 1 to 88. SOAS correlated significantly with radiographic Samilson and KL scores (R = 0.82, P < 0.001), but not with Hamada scores (R = -0.07, P = 0.60). The highest correlations with Samilson scores were found for cartilage (R = 0.82, P < 0.001) and osseous findings (R = 0.86, P < 0.001). SOAS scores were significantly different between different Samilson grades (Samilson 0, 13.4 ± 7.6; Samilson 1, 26.0 ± 9.1; Samilson 2, 38.2 ± 19.2; Samilson 3, 65.5 ± 13.0; P < 0.05). The ability of the SOAS score to predict incident radiographic shoulder OA (KL grade ≥2) was excellent (AUC = 0.91; P < 0.001). DATA CONCLUSION: The newly developed semiquantitative MRI-based SOAS score represents the severity of global shoulder OA and structure-specific shoulder degeneration with excellent reliability in a standardized manner and may therefore be helpful in MRI research studies of the shoulder. LEVEL OF EVIDENCE: 3 Technical Efficacy: Stage 2 J. Magn. Reson. Imaging 2018.
Journal title abbreviation:: J Magn Reson Imaging
Year:: 2019
Journal volume:: 49
Journal issue:: 7
Pages contribution:: e152-e163
Fulltext / DOI:: doi:10.1002/jmri.26251
Pubmed ID:: http://view.ncbi.nlm.nih.gov/pubmed/30079543
Print-ISSN:: 1053-1807
TUM Institution:: Fachgebiet Neuroradiologie (Prof. Zimmer)
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