Community Research and Development Information Service - CORDIS

Novel anatomical hip prosthesis

Trials are underway for the development of a new hip replacement technique, which will eliminate the problems with current replacement methods. This total anatomical hip prosthesis will restore the features of the hip, allowing it to function naturally.
Novel anatomical hip prosthesis
This new technique will utilise a pressure fitting system, rather than the 'lever' system currently used. This can be used for the rehabilitation of patients who do not require the total removal of the hip head.

Current hip prostheses involve using a metal lever to secure the artificial implant to the hip. This technique has a number of problems that often result in implant failure and implant related pathologies. The metal lever, or rod, which is used to keep the replacement hip in place, is often not secure, and can lead to movement of the replacement hip. The metal itself can also cause an allergic reaction inside the body and illnesses due to its toxicity. The fittings can also fragment inside the body, causing localised pain, and the prosthetic hip may restrict mobility.

This new anatomical hip prosthesis has been developed by considering the needs of the patient, and the physiological structure of the body. Also considered, were the technological aspects of the implants and the materials used. The new prosthesis will utilise a hemispherical acetabulum, or hip joint, standing on a spherical cap, held in place by a pressurised fitting. Since our natural joints are spherical in shape, the implant will be anatomical.

The fitting will exclude the use of metals, eliminating the problem of metal toxicity. The fitting will also get rid of every type of present fitting, which inevitably fragments. Movement of the implant inside the body, which occurs with lever style implants, is eliminated by the use of the pressurised fitting.

The implant will restore, without altering, the natural functional features of the hip and will work in harmony with the patient's bone structure, giving mobility, stability and balance.
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