title: [Radiologic aspects of the loosening of cemented hip prostheses: mechanical, septic or granulomatous etiology?].
abstract: Radiologic diagnosis of hip prosthesis loosening is based on the evaluation of each component (prosthesis, cement, bone) and of their interfaces. Both the prosthesis and the cement may deteriorate and the prosthesis/cement interface or cement/bone interface may become abnormal in prosthesis loosening of any etiology. In contrast, the aspect of the bone changes (erosion, periostitis) and their distribution vary according to the condition etiology. It appears from a retrospective study of 50 cases of chronic hip prosthesis loosening that the most specific signs for infection are unsharp bone resorption and acute-like or multifocal periostitis. In granulomatous loosening, bone resorption is sharp (as in mechanical loosening), but its distribution is not conform to the prosthesis shape (as in septic loosening), and periosteal changes are not observed.
authors.affiliation: Université Catholique de Louvain, Département d'Imagérie Médicale, Cliniques Universitaires Saint-Luc, Bruxelles, Belgium.
authors.forename: J
authors.initials: J
authors.lastname: Malghem
authors.forename: A
authors.initials: A
authors.lastname: Mosseray
authors.forename: B
authors.initials: B
authors.lastname: Vande Berg
authors.forename: C
authors.initials: C
authors.lastname: Lebon
authors.forename: B
authors.initials: B
authors.lastname: Maldague
mesh_terms: D019644:Arthroplasty, Replacement, Hip; D001843:Bone Cements / Q000737:chemistry; D001847:Bone Diseases / Q000150:complications / Q000000981:diagnostic imaging; D001862:Bone Resorption / Q000000981:diagnostic imaging / Q000209:etiology; D002484:Cementation; D005269:Femur / Q000000981:diagnostic imaging* / Q000601:surgery; D015745:Granuloma, Foreign-Body / Q000150:complications / Q000000981:diagnostic imaging; D006622:Hip Prosthesis; D006801:Humans; D008768:Methylmethacrylates / Q000737:chemistry; D016348:Osseointegration; D010522:Periostitis / Q000000981:diagnostic imaging / Q000209:etiology; D011474:Prosthesis Design; D011475:Prosthesis Failure; D016459:Prosthesis-Related Infections / Q000150:complications / Q000000981:diagnostic imaging; D011859:Radiography; D012189:Retrospective Studies; D013314:Stress, Mechanical; D013499:Surface Properties
chemical_list: D001843:Bone Cements; D008768:Methylmethacrylates