Comparison of numerical results of bone remodelling and clinical observations in short-stem hip-jointprosthesis

Background: Investigations of the density distribution of bone caused by implants make predictions in bone remodelling possible. For the execution of these analyses, a method is presented with finite element calculation.

Methods: A biophysical model based upon a finite-element calculation is examined with numerical calculations of short-stemmed (Mayo and Spiron), uncemented prostheses. Changes in bone mineral density -- measured over a period of 5 years in 100 patients after total hip replacement, -- were used as reference for the quantitative check calculations. The developed algorithm underlying these FE-calculations was subjected to an application test, and both an approved and new short-stemmed artificial limb system regarding its density distribution is simultaneously examined.

Results: The spiron-system was found to have the lowest resorption behaviour.

Conclusions: For the short-stem prosthesis bone remodelling activity in the area of the medial proximal corticalis is obviously.