title: Anterior capsular shift volume reduction: an in vitro comparison of 3 techniques.
abstract: The anterior capsular shift is a well-established procedure for correction of capsular redundancy. Several different techniques have been developed to reduce capsular volume via a shift or capsulorrhaphy. The purpose of this study was to compare volume reduction objectively among 3 popular capsular shift techniques. Twenty-four fresh-frozen human cadaver shoulders were assigned to one of three groups: a lateral (humeral)-based T-capsular shift (group A), a medial (glenoid)-based T-capsular shift (group B), or a central vertical capsular shift (group C). Initial capsular volume was measured by repeated injection of a viscous fatty acid sulfate solution and recorded for each specimen. A predetermined capsular shift procedure was performed on each cadaver, and repeated measurements were made. All 3 procedures resulted in a significant reduction in capsular volume. The lateral (humeral)-based T-capsular shift resulted in the most reduction (48.9%). This reduction was statistically greater than for the glenoid-based shift (36.8% volume reduction) and approached statistical significance for the vertical shift (40.3% volume reduction, P =.12). Repeated measurements confirmed that the injection technique was valid and reproducible. The lateral (humeral)-based capsular shift results in the most volume reduction and should be considered the preferred procedure for patients with excessive capsular redundancy.
authors.affiliation: Department of Orthopedic Surgery, University of Virginia, Charlottesville, 22903, USA. mdm3p@virginia.edu
authors.forename: Mark D
authors.initials: MD
authors.lastname: Miller
authors.forename: Karl M
authors.initials: KM
authors.lastname: Larsen
authors.forename: Timothy
authors.initials: T
authors.lastname: Luke
authors.forename: Henry T
authors.initials: HT
authors.lastname: Leis
authors.forename: Kevin D
authors.initials: KD
authors.lastname: Plancher
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D007593:Joint Instability / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D019637:Orthopedic Procedures; D012785:Shoulder Joint; D016896:Treatment Outcome