title: The diagnostic value of magnetic resonance imaging for different types of subscapularis lesions.
abstract: OBJECTIVE
  To investigate the accuracy of preoperative 1.5 T magnetic resonance imaging (MRI) interpreted with standardized procedure for diagnosing subscapularis (SSC) tears identified by arthroscopy. The diagnostic accuracy of MRI for different types of SSC lesions was also evaluated.
  
  
  METHODS
  Two-hundred and seventy-two consecutive patients with rotator cuff tears identified by arthroscopy were included into this study. All patients had preoperative MRI scans with 1.5 T strength. Totally, seven different signs of SSC tears were evaluated on MRI scans. The diagnostic value of MRI was evaluated, respectively, according to two classifications of SSC lesions. The definitive diagnosis for SSC lesions was based on the arthroscopic findings.
  
  
  RESULTS
  Among the 272 patients in this study, 107 (39 %) had SSC tears confirmed by arthroscopy. The surgeons correctly diagnosed 88 of 107 patients with SSC tears. The overall sensitivity was 82.2 %. The sensitivity of MRI for types I, II, III, IV and V was 70, 82.4, 96, 100 and 100 %, respectively, based on the classification by Lafosse. The sensitivity of MRI for partial-thickness and partial-width, full-thickness and partial-width, full-thickness and full-width tear was 75.3, 96.2, 100 %, respectively, according to the classification by Kim.
  
  
  CONCLUSIONS
  The sensitivity of MRI in predicting SSC tears preoperatively was improved with the current procedure. Understanding of certain MRI characteristics of SSC tears could increase the accuracy for diagnosing SSC lesions. 1.5 T MRI of the SSC was not reliable for predicting partial thickness and especially less than 1/3 width tears.
  
  
  METHODS
  III.
authors.affiliation: Institute of Sports Medicine, Peking University Third Hospital, No. 49, North Garden Road, Haidian District, Beijing, 100191, People's Republic of China.
authors.forename: Lin
authors.initials: L
authors.lastname: Lin
authors.affiliation: Institute of Sports Medicine, Peking University Third Hospital, No. 49, North Garden Road, Haidian District, Beijing, 100191, People's Republic of China.
authors.forename: Hui
authors.initials: H
authors.lastname: Yan
authors.affiliation: Institute of Sports Medicine, Peking University Third Hospital, No. 49, North Garden Road, Haidian District, Beijing, 100191, People's Republic of China.
authors.forename: Jian
authors.initials: J
authors.lastname: Xiao
authors.affiliation: Institute of Sports Medicine, Peking University Third Hospital, No. 49, North Garden Road, Haidian District, Beijing, 100191, People's Republic of China.
authors.forename: Zhenming
authors.initials: Z
authors.lastname: He
authors.affiliation: Institute of Sports Medicine, Peking University Third Hospital, No. 49, North Garden Road, Haidian District, Beijing, 100191, People's Republic of China.
authors.forename: Hao
authors.initials: H
authors.lastname: Luo
authors.affiliation: Institute of Sports Medicine, Peking University Third Hospital, No. 49, North Garden Road, Haidian District, Beijing, 100191, People's Republic of China.
authors.forename: Xu
authors.initials: X
authors.lastname: Cheng
authors.affiliation: Institute of Sports Medicine, Peking University Third Hospital, No. 49, North Garden Road, Haidian District, Beijing, 100191, People's Republic of China.
authors.forename: Yingfang
authors.initials: Y
authors.lastname: Ao
authors.affiliation: Institute of Sports Medicine, Peking University Third Hospital, No. 49, North Garden Road, Haidian District, Beijing, 100191, People's Republic of China. cgq3019@vip.163.com.
authors.forename: Guoqing
authors.initials: G
authors.lastname: Cui
mesh_terms: D000328:Adult; D000368:Aged; D001182:Arthroscopy; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D011300:Preoperative Care; D000070636:Rotator Cuff Injuries / Q000000981:diagnostic imaging* / Q000601:surgery; D012680:Sensitivity and Specificity
keywords: Arthroscopy; MRI; Subscapularis tear