Analysis of three different reverse shoulder arthroplasty designs for cuff tear arthropathy - the combination of lateralization and distalization provides best mobility.

"Declarations Ethics approval and consent to participateThe study was performed in accordance with the standards of the Ethics Committee of Zurich (Kantonale Ethikkommission [KEK], Stampfenbachstrasse 121, CH-8090 Zurich, Switzerland; KEK-ZH-Nr. 2014–0483), Institutional Board Committee at Charité Universitaetsmedizin Berlin (Ethikausschuss am Campus Virchow-Klinikum, Charitéplatz 1, DE-10117 Berlin, Germany; Antragsnr. EA2/173/18) and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.All patients provided written informed consent prior to patient enrolment / data collection and use of their data for research purposes. Consent for publicationNot applicable. Competing interestsFlorian Freislederer is a paid consultant of Stryker Inc.Philipp Moroder is a paid consultant of and receives royalties from Arthrex Inc.Markus Scheibel is a paid consultant of and receives royalties from Stryker Inc. Competing interests Florian Freislederer is a paid consultant of Stryker Inc. Philipp Moroder is a paid consultant of and receives royalties from Arthrex Inc. Markus Scheibel is a paid consultant of and receives royalties from Stryker Inc."

"Funding No specific financial source of funding. Support was provided by the Schulthess Clinic."