title: Does restriction of glenohumeral horizontal adduction reflect posterior capsule thickening of the throwing shoulder?
abstract: [Purpose] Glenohumeral posterior capsule tightness possibly relates to posterior capsule thickness (PCT). The purpose of the current study was to analyze the relationships between PCT and glenohumeral range of motion (ROM) in horizontal adduction (HAdd) and internal rotation (IR). [Subjects and Methods] This study recruited 39 healthy collegiate baseball players. We measured PCT by using ultrasonography and ROM of the glenohumeral joint of the throwing shoulder by using a digital inclinometer. Pearson's correlation coefficients were calculated between PCT and HAdd or IR ROM. [Results] There was no correlation between PCT and HAdd ROM, but PCT was significantly correlated with IR ROM. [Conclusion] This result indicates that posterior shoulder capsule tightness only relates to IR ROM, and that restricted HAdd ROM might reflect tightness of other tissue, such as the posterior deltoid.
authors.affiliation: Graduate School of Health Sciences, Hokkaido University, Japan ; Matsuda Orthopaedic Memorial Hospital, Japan.
authors.forename: Tomonobu
authors.initials: T
authors.lastname: Ishigaki
authors.affiliation: Graduate School of Health Sciences, Hokkaido University, Japan ; Hokushin Hospital, Japan.
authors.forename: Tomoya
authors.initials: T
authors.lastname: Ishida
authors.affiliation: Faculty of Health Sciences, Hokkaido University, Japan.
authors.forename: Mina
authors.initials: M
authors.lastname: Samukawa
authors.affiliation: Faculty of Health Sciences, Hokkaido University, Japan.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Saito
authors.affiliation: Matsuda Orthopaedic Memorial Hospital, Japan.
authors.forename: Yuya
authors.initials: Y
authors.lastname: Ezawa
authors.affiliation: Graduate School of Health Sciences, Hokkaido University, Japan.
authors.forename: Motoki
authors.initials: M
authors.lastname: Hirokawa
authors.affiliation: School of Health and Rehabilitation Sciences, University of Pittsburgh, USA.
authors.forename: Takumi
authors.initials: T
authors.lastname: Kato
authors.affiliation: Matsuda Orthopaedic Memorial Hospital, Japan.
authors.forename: Makoto
authors.initials: M
authors.lastname: Sugawara
authors.affiliation: Faculty of Health Sciences, Hokkaido University, Japan.
authors.forename: Harukazu
authors.initials: H
authors.lastname: Tohyama
authors.affiliation: Faculty of Health Sciences, Hokkaido University, Japan.
authors.forename: Masanori
authors.initials: M
authors.lastname: Yamanaka
keywords: Capsule thickness; Horizontal adduction; Internal rotation