title: Direct injection of blood into the labrum enhances the stability provided by the glenoid labral socket.
abstract: We tested the hypothesis that the stabilizing function of the labrum can be enhanced by inflating it with blood. In 6 fresh cadaveric glenoids, the anteroinferior stability provided by the glenoid was quantitated by measuring the maximal angle between the glenoid centerline and the direction of the force applied via a ball in the glenoid before the ball dislocated from the glenoid. This stability angle was measured for each of 4 different applied loads. These measurements were repeated after the anteroinferior labrum was augmented by the injection of fresh blood. Injection augmentation of the labrum significantly increased the measured stability angles in 5 of 6 specimens. The 1 outlier had a partial labral tear. The mean increase in stability for all 6 glenoids ranged from 19% to 30% for the different test loads. Labral injection with blood may be a useful adjunct in the surgical management of glenohumeral instability.
authors.affiliation: Department of Orthopaedics and Sports Medicine, University of Washington, Seattle, WA 98195, USA.
authors.forename: Laura J M
authors.initials: LJ
authors.lastname: Matsen
authors.forename: Carolyn
authors.initials: C
authors.lastname: Hettrich
authors.forename: Andrew
authors.initials: A
authors.lastname: Tan
authors.forename: Kevin L
authors.initials: KL
authors.lastname: Smith
authors.forename: Frederick A
authors.initials: FA
authors.lastname: Matsen
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D001769:Blood; D002102:Cadaver; D005260:Female; D006801:Humans; D007270:Injections, Intra-Articular; D017746:Joint Capsule; D007593:Joint Instability / Q000628:therapy*; D008297:Male; D010865:Pilot Projects; D016059:Range of Motion, Articular; D012785:Shoulder Joint