change in center of rotation with reverse total shoulder arthroplasty

The COR was medially displaced by 28 4 mm with the Delta prosthesis and by 19 3 mm with the Encore prosthesis 
​Matthew D. Saltzman, MDa , Deana M. Mercer, MDc , Winston J. Warme, MDb , Alexander L. Bertelsen, PA-Cb , Frederick A. Matsen III, MDb, * 

​: Frederick A. Matsen III, MD, Department of Orthopedics and Sports Medicine, University of Washington Medical Center, Box 356500, 1959 NE Pacific St, Seattle, WA 98195. E-mail address: [email protected] (F.A. Matsen III).