EFFECT OF FRICTION BETWEEN UHMWPE AND PMMA ON THE SHOULDER ARTHROPLASTY

摘要

The aim of the study was to investigate the effect of friction between PMMA bone cement and UHMWPE glenoid component on stresses and tilting using a FE model. The FE model of a cemented glenoid component was loaded with a joint compression and subluxation force of 725 and 350 N, respectively, with different coefficients of friction in the PMMA/UHMWPE interface. The maximal principal stresses in the cement layer ranged between 21.30 and 32.18 MPa. Glenoid component tilting ranged between 0.943° and 0.513°. It was found that the interface condition has a large effect on the maximal principal stresses and glenoid component tilting. Whether adhesion between the UHMWPE component and PMMA bone cement occurs, is unknown beforehand and, as a result, design validation using the FE technique should be done both by using contact elements in combination with a coefficient of friction as well as a full bonding at this interface.