Muscle fat content in the intact infraspinatus muscle correlates with age and BMI, but not critical shoulder angle.

Anwander, Helen; Fuhrer, Fabian; Diserens, Gaëlle; Moor, Beat Kaspar; Boesch, Chris; Vermathen, Peter; Valenzuela, Waldo; Zumstein, Matthias A. (2019). Muscle fat content in the intact infraspinatus muscle correlates with age and BMI, but not critical shoulder angle. (In Press). European journal of trauma and emergency surgery Springer-Medizin-Verlag 10.1007/s00068-019-01246-7

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PURPOSE Muscle fat content of the rotator cuff increases after a tear. In the healthy rotator cuff, the influence of age, body mass index (BMI) and critical shoulder angle (CSA) on muscle fat content is unknown. The primary aim was to correlate muscle fat content with age, BMI and CSA. The secondary aims were (1) to correlate muscle fat content in the entire muscle and slice Y (most lateral sagittal slice with scapular spine) and (2) assessed the reliability for CSA measurement in MRI. METHODS In 26 healthy shoulders (17 subjects), aged 40-65 years, BMI 20-35 kg/m2, Goutallier grade 0, Dixon MRI was applied. The CSA was > 35° in 14 shoulders and < 30° in 12 shoulders. Muscle fat content was calculated from Dixon MRI. RESULTS Infraspinatus muscle fat content correlates moderately with age (r = 0.553; p = 0.003) and BMI (r = 0.517; p = 0.007). Supraspinatus muscle fat content does not correlate with age (r = 0.363, p = 0.069) and BMI (r = 0.342, p = 0.087). No correlation between CSA and muscle fat content was found. Muscle fat content measurement in the entire muscle correlates strongly with measurement in slice Y (intraclass correlation coefficient supraspinatus muscle: 0.757; infraspinatus muscle: 0.794). CSA intermethod analysis between radiography and MR images shows very high reliability (intraclass correlation coefficient > 0.9) and no systematical deviation in Bland-Altman analysis. CONCLUSION Muscle fat content in the healthy infraspinatus muscle does correlate with age and BMI, but not with the CSA. Muscle fat content measurement in the rotator cuff using Dixon MRI showed a high reliability between slice Y and the entire muscle. LEVEL OF EVIDENCE III.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > Department of Orthopaedic, Plastic and Hand Surgery (DOPH) > Clinic of Orthopaedic Surgery
04 Faculty of Medicine > Pre-clinic Human Medicine > Institute for Surgical Technology & Biomechanics ISTB
04 Faculty of Medicine > Department of Radiology, Neuroradiology and Nuclear Medicine (DRNN) > Institute of Diagnostic, Interventional and Paediatric Radiology > DCR Magnetic Resonance Spectroscopy and Methodology (AMSM)
04 Faculty of Medicine > Department of Radiology, Neuroradiology and Nuclear Medicine (DRNN) > Institute of Diagnostic, Interventional and Paediatric Radiology
04 Faculty of Medicine > Pre-clinic Human Medicine > BioMedical Research (DBMR)

UniBE Contributor:

Anwander, Helen; Diserens, Gaëlle; Moor, Beat Kaspar; Boesch, Christoph Hans; Vermathen, Peter; Valenzuela, Waldo Enrique and Zumstein, Matthias

Subjects:

600 Technology > 610 Medicine & health
500 Science > 570 Life sciences; biology

ISSN:

1863-9933

Publisher:

Springer-Medizin-Verlag

Language:

English

Submitter:

Maria de Fatima Henriques Bernardo

Date Deposited:

06 Nov 2019 15:31

Last Modified:

06 Nov 2019 15:31

Publisher DOI:

10.1007/s00068-019-01246-7

PubMed ID:

31673713

Uncontrolled Keywords:

CSA Critical shoulder angle Dixon MRI Muscle fat content Quantitative magnetic resonance imaging Rotator cuff

BORIS DOI:

10.7892/boris.134561

URI:

https://boris.unibe.ch/id/eprint/134561

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