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Using chemical-shift MR imaging to quantify fatty degeneration within supraspinatus muscle due to supraspinatus tendon injuries

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Abstract

The objective of this study was to prospectively quantify the fatty degeneration of supraspinatus (SSP) muscle due to SSP tendon injuries by using chemical-shift magnetic resonance imaging (CS-MRI). Forty-one patients with suspected rotator cuff tear or impingement examined with MR arthrography were included in the study. The following images were obtained after injection of diluted gadolinium chelate into glenohumeral joint: fat-saturated T1-weighted spin echo in the coronal, axial, and sagittal-oblique plane; fat-saturated T2-weighted and intermediate-weighted fast spin-echo in the coronal-oblique plane; and T1-weighted spin echo in the sagittal-oblique plane. CS-MRI was performed in the coronal plane using a double-echo fast low-angle shot (FLASH) sequence. SSP tendon changes were classified as normal, tendinosis, and partial and complete tear according to MR arthrography findings. Fatty degeneration was quantified after measurement of signal intensity values within the region of interest (ROI) placed over SSP muscle. Signal intensity (SI) suppression ratio and SI index were calculated with the values obtained. Degrees of fatty degeneration depicted in normal subjects and subjects with rotator cuff injuries were compared. Median (min:max) was used as descriptive values. SI suppression ratio was −3.5% (−15.5:3.03) in normal subjects, whereas it was −13.5% (−28.55:−6.60), −30.7% (−41.5:−20.35), and −43.75% (−62:−24.90) in tendinosis, partial and complete tears, respectively. SI index was 0.75% (−6:11.5) in normal subjects. It was 10% (4.50:27), 26.5% (19.15:35.5), and 41% (23.9:57) in tendinosis, partial and complete tears, respectively. The increase in degree of fatty degeneration parallels the seriousness of tendon pathology. CS-MRI is a useful method for grading fat accumulation within SSP muscle.

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Authors and Affiliations

  1. Department of Radiology, Uludag University Medical Faculty, Gorukle, Bursa, Turkey

    Gokhan Gokalp, Nalan Yildirim & Zeynep Yazici

  2. Department of Biostatistics, Uludag University Medical Faculty, Gorukle, Bursa, Turkey

    Ilker Ercan

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  1. Gokhan Gokalp
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  2. Nalan Yildirim
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Correspondence to Gokhan Gokalp.

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Gokalp, G., Yildirim, N., Yazici, Z. et al. Using chemical-shift MR imaging to quantify fatty degeneration within supraspinatus muscle due to supraspinatus tendon injuries. Skeletal Radiol 39, 1211–1217 (2010). https://doi.org/10.1007/s00256-010-0927-z

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  • DOI: https://doi.org/10.1007/s00256-010-0927-z

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