The taper corrosion pattern observed for one bi-modular stem design is related to geometry-determined taper mechanics

Highlights • Geometrical mismatches explain permanent stress concentrations at the taper apexes. • Adhesive no-wear patches were identified within highly worn, high stress regions. • The taper design is sensitive to manufacturing precision and assembly conditions. • Tapers subsiding the physiological load may seat into canted positions. • The engagement may have provided the mechanical basis for the observed wear patterns