Reverse Shoulder Arthroplasty

The reverse shoulder prosthesis, also known as the Grammont prosthesis, reverses normal shoulder anatomy. Instead of reproducing the normal anatomy of the humeral head as ball and glenoid fossa as cup, the reverse shoulder arthroplasty replaces the humeral head with a cup and the glenoid fossa with a ball. This design moves the center of rotation of the shoulder joint distal and medial compared with the anatomic center of rotation. This improves the leverage of the deltoid muscle and allows it to compensate for deficient rotator cuff musculature and provide an increased range of motion.

References

Roberts CC, et al. Radiologic Assessment of Reverse Shoulder Arthroplasty. RadioGraphics 2007 27:223-235.