棘上筋腱に対する３次元超音波検査と MRI 検査

概要

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The aim of this study was to evaluate the usefulness of the 3 dimensional ultrasonography (3DUS) of the supraspinatus (SSp) tendon based on the T2 weighed MRI(STIR) findings of the same tendon. Both 3 DUS and MRI were performed on the SSp tendons of 65 patients. The right shoulders were involved in 46 patients, left in 27 patients and both in 8 patients. 3DUSs of SSp tendon were divided into 4 groups by their configurations namely convex type, flat type, irregular type and defect type.T2 weighed MRIs (STIR) were classified into 4 types by the location and extent of high signal intensity(HSI), namely none(N) : no HSI was present in the tendon, ( B ) : HSI was located in bursal side of the tendon, ( I ) : HSI was located in the middle of the tendon, ( J ) : HSI was located in the joint side of the tendon and ( C ) : HSI was located in the whole depth and some width of the tendons.I analyzed 3DUSs by the distribution of HSI of MRIs. Convex type revealed HSI (B, I, J, and C) in 44.7%(17/38), flat in 87.5% (7/8), irregular in 89.5% (17/19) and defect in 100% (8/8). As the HSI of ( C ), convex type revealed in 10.5% (4/38) , flat in 50% (4/8 ), irregular in 36.8% (7/19) and defect in 87.5% (7/8). The HSI of T2 weighed MRI demonstrate the torn portion of SSp tendons. Therefore, this classification of 3DUS and 3DUS of the SSp tendon seemed to be useful for detecting the pathology of the SSp tendon.