Patent for New Glenoid Component for Shoulder Prosthesis Design

The US Patent Office has awarded a patent to the 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, managing director of HSS Ventures, an affiliate of the 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. [hssventures]


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.
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About Hospital for Special Surgery


Founded in 1863, Hospital for Special Surgery is a world leader in orthopedics, rheumatology and rehabilitation. Top ranked
in the Northeast in its specialties by U.S. News & World Report, HSS was awarded Magnet Recognition for Excellence in Nursing
Service from the American Nurses Credentialing Center. A member of the NewYork-Presbyterian Healthcare System and an
affiliate of Weill Medical College of Cornell University, HSS provides orthopedic and rheumatologic patient care at
NewYork-Presbyterian Hospital at NewYork Weill Cornell Medical Center. All HSS medical staff are on the faculty of Weill
Medical College of Cornell University. Its 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, hss


Hospital for Special Surgery

535 E. 70th St.

New York, NY 10021

USA

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