Chun-Yan Tian1, Guo-Qing Cui, Zhuo-Zhao Zheng, A-Hong Ren. 1. Department of Radiology, Peking University Third Hospital, 49 North Garden Road, Haidian District, Beijing 100191, PR China. tcyzhs@yahoo.com.cn
Abstract
PURPOSE: The purpose of this study is to compare MR arthrography in abduction and external rotation (ABER) position with conventional MR arthrography in neutral position for the detection and further classification of anteroinferior labroligamentous lesions. MATERIALS AND METHODS: Two hundred and twenty-nine cases of shoulder MR arthrography with subsequent arthroscopy were retrospectively evaluated. All MR arthrograms in ABER position and neutral position were independently assessed by two radiologists who were blinded to the arthroscopic findings. Sensitivities and specificities of both positions for detection and further categorization of anteroinferior labroligamentous lesions were calculated and compared using paired McNemar test. K values were calculated to quantify the level of interobserver agreement. RESULTS: At arthroscopy, 24 Bankart lesions, 59 ALPSA lesions, 39 Perthes lesions, 8 GLAD lesions, 4 ALIPSA lesions, 31 nonclassifiable lesions and 60 intact anteroinferior complexes were found. The sensitivity of MR arthrography in ABER position for detecting anteroinferior labroligamentous lesions was significantly higher than that of in neutral position (92.7-94.5% versus 81.8-83%, P<0.05). For the detection rate of the mentioned 6 subtypes of lesions, only the Perthes lesions had significant improvement in ABER position when compared with conventional MR arthrography (observer 1, 61.5-87.2%, P=0.006; observer 2, 69.2-92.3%, P=0.004). MR arthrography in ABER position was more effective in identifying of Perthes lesions (66.7-74.4% versus 35.9-40%, P<0.05) while the conventional MR arthrography was more effective in accurate diagnose of ALPSA lesions (74.6-78.0% versus 54.2-55.9%, P<0.05). No statistically significant difference of the diagnostic accuracy was found between the two positions for Bankart lesions, GLAD lesions, and ALIPSA lesions. CONCLUSION: MR arthrography in ABER position has more added value on detection of Perthes lesions in evaluation of anteroinferior labroligamentous complex tear.
PURPOSE: The purpose of this study is to compare MR arthrography in abduction and external rotation (ABER) position with conventional MR arthrography in neutral position for the detection and further classification of anteroinferior labroligamentous lesions. MATERIALS AND METHODS: Two hundred and twenty-nine cases of shoulder MR arthrography with subsequent arthroscopy were retrospectively evaluated. All MR arthrograms in ABER position and neutral position were independently assessed by two radiologists who were blinded to the arthroscopic findings. Sensitivities and specificities of both positions for detection and further categorization of anteroinferior labroligamentous lesions were calculated and compared using paired McNemar test. K values were calculated to quantify the level of interobserver agreement. RESULTS: At arthroscopy, 24 Bankart lesions, 59 ALPSA lesions, 39 Perthes lesions, 8 GLAD lesions, 4 ALIPSA lesions, 31 nonclassifiable lesions and 60 intact anteroinferior complexes were found. The sensitivity of MR arthrography in ABER position for detecting anteroinferior labroligamentous lesions was significantly higher than that of in neutral position (92.7-94.5% versus 81.8-83%, P<0.05). For the detection rate of the mentioned 6 subtypes of lesions, only the Perthes lesions had significant improvement in ABER position when compared with conventional MR arthrography (observer 1, 61.5-87.2%, P=0.006; observer 2, 69.2-92.3%, P=0.004). MR arthrography in ABER position was more effective in identifying of Perthes lesions (66.7-74.4% versus 35.9-40%, P<0.05) while the conventional MR arthrography was more effective in accurate diagnose of ALPSA lesions (74.6-78.0% versus 54.2-55.9%, P<0.05). No statistically significant difference of the diagnostic accuracy was found between the two positions for Bankart lesions, GLAD lesions, and ALIPSA lesions. CONCLUSION: MR arthrography in ABER position has more added value on detection of Perthes lesions in evaluation of anteroinferior labroligamentous complex tear.
Authors: Giovanni J Passanante; Matthew R Skalski; Dakshesh B Patel; Eric A White; Aaron J Schein; Christopher J Gottsegen; George R Matcuk Journal: Emerg Radiol Date: 2016-08-16
Authors: Peter Brownson; Oliver Donaldson; Michael Fox; Jonathan L Rees; Amar Rangan; Anju Jaggi; Graham Tytherleigh-Strong; Julie McBernie; Michael Thomas; Rohit Kulkarni Journal: Shoulder Elbow Date: 2015-05-26
Authors: Fernando Ruiz Santiago; Alberto Martínez Martínez; Pablo Tomás Muñoz; José Pozo Sánchez; Antonio Zarza Pérez Journal: Quant Imaging Med Surg Date: 2017-08
Authors: Christoph Schaeffeler; Simone Waldt; Jan S Bauer; Chlodwig Kirchhoff; Bernhard Haller; Michael Schröder; Ernst J Rummeny; Andreas B Imhoff; Klaus Woertler Journal: Eur Radiol Date: 2014-03-13 Impact factor: 5.315