title: Concentric wear of the Delrin disc of a Björk-Shiley prosthesis: an uncommon cause of prosthetic incompetence.
authors.forename: A
authors.initials: A
authors.lastname: Mazzucco
authors.forename: P
authors.initials: P
authors.lastname: Morea
authors.forename: A
authors.initials: A
authors.lastname: Milano
authors.forename: U
authors.initials: U
authors.lastname: Bortolotti
mesh_terms: D000368:Aged; D006350:Heart Valve Prosthesis; D006801:Humans; D008297:Male; D008944:Mitral Valve Insufficiency / Q000209:etiology*; D011475:Prosthesis Failure