The Peribursal Fat Plane in MR Imaging of Patients with Subacromial Impingement Syndrome

Fukushima S., Yoneda M., Hayashida K., Hirooka A., Wakitani S., Tsumaki N.

doi:10.11296/katakansetsu1977.18.2_234

[Purpose] To determine the implications of changes of the peribursal fat plane (FP) on MR imaging (MRI) of patients with subacromial impingement syndrome.<br>[Materials and Methods] Fifty-three patients who had undergone arthroscopic surgical treatment for subacromial impingement syndrome were studied. All the patients had a good response to subacromial decompression. The mean age at surgery was 33 years (14-64). FP was evaluated in the oblique coronal view, and was classified as follows: a plane visible along the bursal layer on T1-weighted images (T1WI) “Type I”, a signal intensity of the plane on T2^*-weighted images (T2^* WI) were higher than those of T1WI“Type II”, and the plane was not detectable on T1WI “Type III”. Using T2^* WI, type II patients were then classified as having a thin FP (IIn) or a thick FP (Ilk). The bursal findings confirmed at arthroscopic surgery were classified as follows: bursal synovitis (BS), bursal fibrosis (BF), bursal thickening (BT), bursal adhesion (BA). The FP type were compared with the bursal findings.<br>[Results and Discussion] MRI findings were classified as Type I in 25 shoulders, type II in 23shoulders (IIn in 17, IIk in 6), and type III in 5 shoulders. Bursoscopic findings were synovitis in 27, thickening in 33, fibrosis in 25, adhesion in 25 and normal in 3 shoulders. BT was detected in 71% of Type IIn. BS was found in 83% of Type IIk. BS and a BA were found in 83% of Type III.<br>[Conclusions] Changes of FP reflect the bursal state, but the presence of an FP does not always mean the subacromial bursa is norma

The Peribursal Fat Plane in MR Imaging of Patients with Subacromial Impingement Syndrome

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