title: Biomechanical comparison of component position and hardware failure in the reverse shoulder prosthesis.
abstract: There has been renewed interest in reverse shoulder arthroplasty for the treatment of glenohumeral arthritis with concomitant rotator cuff deficiency. Failure of the prosthesis at the glenoid attachment site remains a concern. The purpose of this study was to examine glenoid component stability with regard to the angle of implantation. This investigation entailed a biomechanical analysis to evaluate forces and micromotion in glenoid components attached to 12 polyurethane blocks at -15 degrees, 0 degrees, and +15 degrees of superior and inferior tilt. The 15 degrees inferior tilt had the most uniform compressive forces and the least amount of tensile forces and micromotion when compared with the 0 degrees and 15 degrees superiorly tilted baseplate. Our results suggest that implantation with an inferior tilt will reduce the incidence of mechanical failure of the glenoid component in a reverse shoulder prosthesis.
authors.affiliation: Musculoskeletal Research Foundation, Florida Orthopaedic Institute, Temple Terrace, FL 33637, USA.
authors.forename: Sergio
authors.initials: S
authors.lastname: Gutiérrez
authors.forename: R Michael
authors.initials: RM
authors.lastname: Greiwe
authors.forename: Mark A
authors.initials: MA
authors.lastname: Frankle
authors.forename: Steven
authors.initials: S
authors.lastname: Siegal
authors.forename: William E
authors.initials: WE
authors.lastname: Lee
mesh_terms: D001168:Arthritis / Q000601:surgery; D019643:Arthroplasty, Replacement / Q000009:adverse effects / Q000379:methods*; D001696:Biomechanical Phenomena; D006801:Humans; D007593:Joint Instability / Q000209:etiology*; D007595:Joint Prosthesis / Q000009:adverse effects*; D011475:Prosthesis Failure; D000070636:Rotator Cuff Injuries; D012785:Shoulder Joint