title: Diagnostic imaging of unstable superior glenoid labral detachment: a comparison between MR arthrography and unenhanced MRI.
abstract: Abstract We compared efficacy of magnetic resonance arthrography (MRA) and magnetic resonance imaging (MRI) for the detection of superior glenoid labral detachment, and especially unstable superior labrum anterior-posterior (SLAP) type 2 lesions. MR imagings and MR arthrograms of 90 shoulders of 90 patients, including 30 shoulders of unstable SLAP 2 lesions, were interpreted by a novice and an expert observer. These results were correlated with arthroscopic findings. For the expert observer, MRI had a sensitivity of 53%, a specificity of 93%, and an accuracy of 80%, which were improved to 60%, 98%, and 85%, respectively, by MRA. These increases were statistically insignificant. For the novice observer, MRI had a sensitivity of 45%, a specificity of 80%, and an accuracy of 64%, which were significantly improved to 76%, 83%, and 80%, respectively, by MRA. In detecting unstable SLAP 2 lesions, MRA proved to be useful to a novice interpreter, but not significantly useful to an experienced interpreter, compared with unenhanced MRI. We advocate MRA as the examination of first choice for detecting unstable SLAP 2 lesions if they are strongly suspected clinically.
authors.affiliation: Department of Sports Medicine, Osaka Kosei-nenkin Hospital , 4-2-78 Fukushima, Fukushima-ku, Osaka-City, Osaka 553-0003 , Japan.
authors.forename: M
authors.initials: M
authors.lastname: Yoneda
authors.forename: K
authors.initials: K
authors.lastname: Izawa
authors.forename: S
authors.initials: S
authors.lastname: Wakitani
authors.forename: S
authors.initials: S
authors.lastname: Nakasato
authors.forename: K
authors.initials: K
authors.lastname: Hayashida
authors.forename: S
authors.initials: S
authors.lastname: Nakagawa