Objective To explore the effectiveness of different ultrasonographic features in the diagnosis of rotatorcuff tear（RCT）

and to screen out specific ultrasonic signs for the diagnosis of RCT.Methods A total of 133 patients of shoulderjoints of RCT were examined by ultrasound.The ultrasonographic features were analyzed by Logistic regression and diagnostictest

and to assess the diagnostic efficiency of different ultrasonographic features on RCT.ResultsIn the gold standard ofarthroscopy and long-term follow-up（≥6 months）

the sensitivity

specificity and diagnostic accuracy rate of rotator cuff tearswere 89.13%

79.31% and 82.70%

respectively. Among those ultrasonographic signs

the most sensitive was the acromiocysticeffusion（56.62%）

and the most specific was the rotator cuff disappearance（100%）. Univariate analysis showed that intra-tendinous abnormal echo

rotator cuff structure defect

tendon thinning

acromion impact syndrome

subacromial synovial sacthickening and humeral head irregularity were significantly correlated with RCT（all P<0.05）.Multivariate analysis showed thatintra-tendinous abnormal echo was an independent risk factor for RCT（P<0.05

OR=1.12）.The intra-tendinous abnormal echoand the cuff structure defect were the main ultrasonographic signs in the diagnosis of RCT.Combined with other ultrasound signs

the sensitivity and specificity could be significantly improved.Conclusion The intra-tendinous abnormal echo and rotator cuffdefect has higher sensitivity and specificity in the diagnosis of RCT

which has a certain clinical diagnostic value.