engleski

Mechanical analysis of the weakness of cone – coupling used in modular assembled hip-prosthesis

Cone-tapers are used in designing modular composed hip-prosthesis. This method offers the surgeons multiple advantages. One of the benefits is given by the fact of allowing a better reconstruction of the individual joint geometry of the patient. Another great advantage is given if it becomes necessary to change parts of the implant. However it may happen that the lifetime of a modular assembled prosthesis is sometimes strongly reduced by pure mechanical failure, for instance by loosening of the contact between the male and female partner of the cone-tapers ; crevice and fretting corrosion can be observed on the original contact surfaces of the partner. The question is, what is the reason for it, what happened first even in cases of an ideal correspondence of the partners from the geometrical point of view and without failure during mounting.

modular hip-prosthesis; cone coupling; failure; contact; plastic deformation

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