Influence of Inclination Angle on the Polyethylene Insert Wear in Experimental Module of Hip Endoprosthesis

Abstract

Localization and the area of polyethylene insert wear in friction pair ofthe experimental module of hip joint (HJ) endoprosthesis was studied under laboratory dynamic conditions simulating its biomechanics at HJ external rotation contracture. It was stated that localization and the area of wear depended on the angle of horizontal inclination infriction pair of HJ endoprosthesis. Almost the same areas of polyethylene wear in anterior and posterior insert segments were observed when inclination angle was equal to that of the hip joint. Reduction of inclination angle resulted in the increase of wear surface in the anterior segment and its decrease in the posterior one. Displacement of the wear zone into the anterior segment was accompanied by the reduction of total insert wear area. At repeated loadings it created conditions for the higher polyethylene insert wear.