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The Grammont reverse prosthesis design maintains the center of rotation within the glenoid vault, which creates an appropriate fulcrum for the deltoid to produce humeral elevation while reducing the risk of glenoid loosening observed with earlier reverse prosthesis designs. (This figure was published in Gartsman GM, Edwards TB. Shoulder Arthroplasty. Philadelphia, PA: ©Saunders; 2008:219–221.)
