Characterizing the Myoarchitecture of the Supraspinatus and Infraspinatus Muscles With MRI Using Diffusion Tensor Imaging

Background The societal cost of shoulder disabilities in our aging society keeps rising. Providing biomarkers of early changes in the microstructure of rotator cuff (RC) muscles might improve surgical planning. Elevation angle (E1A) and pennation angle (PA) assessed by ultrasound change with RC tear...

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Veröffentlicht in:Journal of magnetic resonance imaging 2024-03, Vol.59 (3), p.851-862
Hauptverfasser: Tous, Cyril, Jodoin, Alexandre, Pontré, Beau, Grabs, Detlev, Begon, Mikael, Bureau, Nathalie J., Van Houten, Elijah
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Sprache:eng
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Zusammenfassung:Background The societal cost of shoulder disabilities in our aging society keeps rising. Providing biomarkers of early changes in the microstructure of rotator cuff (RC) muscles might improve surgical planning. Elevation angle (E1A) and pennation angle (PA) assessed by ultrasound change with RC tears. Furthermore, ultrasounds lack repeatability. Purpose To propose a repeatable framework to quantify the myocyte angulation in RC muscles. Study Type Prospective. Subjects Six asymptomatic healthy volunteers (1 female aged 30 years; 5 males, mean age 35 years, range 25–49 years), who underwent three repositioned scanning sessions (10 minutes apart) of the right infraspinatus muscle (ISPM) and supraspinatus muscle (SSPM). Field Strength/Sequence 3‐T, T1‐weighted and diffusion tensor imaging (DTI; 12 gradient encoding directions, b‐values of 500 and 800 s/mm2). Assessment Each voxel was binned in percentage of depth defined by the shortest distance in the antero‐posterior direction (manual delineation), i.e. the radial axis. A second order polynomial fit for PA across the muscle depth was used, while E1A described a sigmoid across depth: E1Asig=E1Arange×sigmf1:100%depth,−EA1grad , E1Aasym+E1Ashift. Statistical Tests Repeatability was assessed with the nonparametric Wilcoxon's rank‐sum test for paired comparisons across repeated scans in each volunteer for each anatomical muscle region and across repeated measures of the radial axis. A P‐value
ISSN:1053-1807
1522-2586
1522-2586
DOI:10.1002/jmri.28840