Hip Resurfacing Implants
In 2008, there were 378,865 hip replacement procedures in the US alone and the number of procedures is predicted to increase with a CAGR of 5.1 % from 2008 to 20151. All hip replacements currently are based upon the ball and socket principle. The acetabular socket component is a part sphere, typically just under a hemisphere, and the femoral head is also a part sphere, typically just over a hemisphere. In human anatomy, while the proportions are similar, the extent of each varies according to well established rules. If the rim of the acetabular socket is deficient, a hip will be unstable, if too much rim is present, a hip will pinch and hurt in flexion or extension. The femoral head is normally perfectly spherical, and positioned exactly on the end of the femoral neck. If it is flattened in adolescence, it may impinge, causing pain and early joint failure.
Existing devices on the market are of simple construction with straight, level edges for ease of design and manufacturing. Typical implant sockets, while fine for normal men, may be too extensive for female pelvises, causing pain. If sited incorrectly, the maximum load may be transmitted too close to the edge of the socket, leading to rapid wear and premature failure. A substantial proportion of hip resurfacing revision procedures result from impingement.
Researchers have improved on the limitations of existing hip implants with an anatomic design based on analysis of CT scan images that accurately mimics the anatomy of the hip joint. This design offers a better range of motion, improves fit and durability as well as avoiding impingement of the iliopsoas tendon.
Patent Status A patent has been filed and the owner is seeking licensing partners.
(1) US Hip Implant Market. Frost and Sullivan Report, 30 June 2009.
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