Abstract #2245

Reliability of MR quantification of rotator cuff muscle fatty degeneration using a 2-point Dixon technique in comparison with the qualitative modified-Goutallier classification

Saya Horiuchi¹, Taiki Nozaki¹, Atsushi Tasaki², Akira Yamakawa², Yasuhito Kaneko³, Takeshi Hara⁴, Yasuyuki Kurihara¹, and Hiroshi Yoshioka³

¹Radiology, St Luke's International Hospital, Tokyo, Japan, ²Orthopedics, St Luke's International Hospital, Tokyo, Japan, ³Radiological Sciences, University of California, Irvine, Orange, CA, United States, ⁴Department of Intelligent Image Information, Gifu University, Gifu, Japan

The assessment of presurgical rotator cuff muscle fatty degeneration is a main determinant of management in patients with rotator cuff tears. The modified-Goutallier classification has been widely accepted as a qualitative method for evaluation of fatty degeneration in current practice. However, reproducibility is insufficient because it is shown to be highly observer-dependent. The objective of this study was to quantify fatty degeneration of the supraspinatus muscle by using 2-point Dixon technique, and to evaluate the inter- and intra-observer reliability of quantitative analysis of fatty degeneration in comparison with the qualitative modified-Goutallier classification.

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