title: Isokinetic strength after tears of the supraspinatus tendon.
abstract: We measured the isokinetic strength of abduction, adduction, internal rotation, and external rotation in ten patients with full-thickness tears of the supraspinatus and ten with partial-thickness tears. The measurements were repeated after intra-articular or intrabursal injection of local anaesthetic. Pain blocks produced significant increases in strength in both full and partial-thickness tears. After the block, the strength in full-thickness tears compared with the opposite side was 67% to 81% in abduction and 67% to 78% in external rotation, both significantly smaller than those on the uninvolved side (p = 0.0064, p = 0.0170). In partial-thickness tears the strength after the block ranged from 82% to 111%, with no significant differences between the involved and uninvolved sides. The decreases in strength of 19% to 33% in abduction and 22% to 33% in external rotation after full-thickness tears appear to represent the contribution of supraspinatus to the strength of the shoulder.
authors.affiliation: Department of Orthopedic Surgery, Akita University School of Medicine, Japan.
authors.forename: E
authors.initials: E
authors.lastname: Itoi
authors.forename: H
authors.initials: H
authors.lastname: Minagawa
authors.forename: T
authors.initials: T
authors.lastname: Sato
authors.forename: K
authors.initials: K
authors.lastname: Sato
authors.forename: S
authors.initials: S
authors.lastname: Tabata
mesh_terms: D000328:Adult; D000368:Aged; D006801:Humans; D007537:Isometric Contraction / Q000502:physiology; D008875:Middle Aged; D012399:Rotation; D017006:Rotator Cuff / Q000601:surgery; D000070636:Rotator Cuff Injuries; D012782:Shoulder / Q000503:physiopathology*