Hospital for Special Surgery Awarded Patent for New Glenoid Component for Shoulder Prosthesis Design

New York, NY—May 31, 2005

The U.S. Patent Office has awarded a patent to Hospital for Special Surgery for a new type of shoulder joint prosthesis design for the glenoid component aimed at improving stability while maintaining fixation. The new design, the subject of US Patent 6,875,234, issued on April 5, 2005, is designed to reduce the risk of future dislocation or artificial shoulder component loosening, two common problems with existing products. However, clinical research still needs to be conducted to show the complete benefits of this new patented design.

"Approximately 20,000 total shoulder replacement surgeries are performed annually in the U.S. with the volume growing at 5% a year due to the increasingly active lives led by aging members of America's post World War II baby boom generation," said Joseph Lipman of HSS Ventures, an affiliate of Hospital for Special Surgery focused on product development, technology licensing and venture investing in orthopedics and rheumatology. Mr. Lipman is the Director of Joint Development at Hospital for Special Surgery.
Shoulder joint replacements are composed of two parts, humeral and glenoid, which function in a ball-in-socket manner like other joints in the body. Finding the right design to optimize movement and minimize wear over time has been a challenge in the past. Prior designs sometimes have been associated with instability and component loosening over time, the leading complication of total shoulder arthroplasty (replacement), according to a Journal of Bone and Joint Surgery paper, entitled "Complications of Total Shoulder Replacement Arthroplasty," written by Michael Wirth and Charles Rockwood in 1996.

The HSS-patented design involves the glenoid component and features two radii of curvature, decreasing the likelihood of dislocation, a problem seen in current designs on the market. The design can be used with the various materials used in replacement shoulders, including metal or polyethylene.

About Hospital for Special Surgery
Hospital for Special Surgery (HSS) is the world’s leading academic medical center focused on musculoskeletal health. HSS is nationally ranked No. 1 in orthopedics and No. 2 in rheumatology by U.S. News & World Report (2016-2017), and is the first hospital in New York State to receive Magnet Recognition for Excellence in Nursing Service from the American Nurses Credentialing Center four consecutive times. HSS has one of the lowest infection rates in the country. HSS is an affiliate of Weill Cornell Medical College and as such all Hospital for Special Surgery medical staff are faculty of Weill Cornell. The hospital's research division is internationally recognized as a leader in the investigation of musculoskeletal and autoimmune diseases. Hospital for Special Surgery is located in New York City and online at


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