Reverse™ Shoulder Prosthesis system

Reverse shoulder prosthesis system components. The metal screw-fixed ball is implanted in the scapula to replace the glenoid, and the concave polyethylene component mounted on the stem is implanted into the proximal humerus to replace the humeral head (image courtesy of Encore Medical, Austin, TX). 

The concept is, however, very much in its infancy and its place in the future of shoulder repair has yet to be determined. Encore Medical Corp. (Austin, TX) is currently conducting an investigational device exemption (IDE) study of its new Reverse Shoulder Prosthesis system (Figure 9.12). The first implantation in North America of another reverse prosthesis design (the Delta prosthesis [DePuy, Warsaw, IN]) was reported to have been conducted on February 27, 2003, hy Dr. Anthony Miniaci in Toronto, Canada (Canada Newswire 2003). The potential benefits of the concept are that it can allow better function than standard prostheses without relying on rotator cuff function and that it can decrease bending moment forces at the prosthesis-glenoid interface. If these benefits are clinically realized, then it could become an important addition to standard prostheses, especially in difficult arthroplasty cases. 

FIGURE 9.7 Global and Delta XTENDTM Reverse shoulder prosthesis system components. Components of the Global system are shown in... 

FIGURE 9.11 Anatomical ShoulderTM contemporary shoulder prosthesis system components. Inverse / Reverse components are shown in (A) and stem and glenoid components and an offset head component are shown in (B). (Images courtesy of Zimmer Holdings, Inc, Warsaw, IN). 

Anatomical Shoulder Inverse/Reverse Reverse design prosthesis component system. The Inverse/ Reverse system was cleared for sale in the United States by the FDA in January 2006. 

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