title: Behavior of the femoral stem in the Bihapro hip prosthesis.
abstract: This study evaluated the hydroxyapatite-coated femoral stem of the Bihapro hip prosthesis (Biomet Ltd, Bridgend, United Kingdom) using radiography, TC-99 scintigraphy, and bone densitometry. Thirty stems with >2 years of follow-up (mean: 31 months) were evaluated. No loosening or changes in the position of the implant were seen, and the mean subsidence was 2.2 mm. Radiography revealed a densification in the metaphyseal zone with reconstruction of the trabecular lines in 21 cases, while in 22 patients, radiolucent lines in the distal area of the femoral component were observed. Scintigraphy showed a diaphyseal normo-captation in 19 cases and a hypercaptation <1.4 with a mean index of 1.1 in 10 patients. Metaphyseal hypercaptation >1.4 was seen in 24 patients. Bone densitometry revealed increased density in the metaphyseal zones in 29 patients with a periprosthetic/normal bone quotient of 1.4.
authors.affiliation: Department of Orthopedic Surgery, Faculty of Medicine, University of Oviedo, Spain.
authors.forename: D
authors.initials: D
authors.lastname: Hernández-Vaquero
authors.forename: A
authors.initials: A
authors.lastname: Murcia-Mazón
authors.forename: J
authors.initials: J
authors.lastname: Paz-Jimenez
authors.forename: R
authors.initials: R
authors.lastname: Alegre-Mateo
authors.forename: J
authors.initials: J
authors.lastname: Martínez-García
authors.forename: J
authors.initials: J
authors.lastname: Pena-Vazquez
mesh_terms: D015519:Bone Density; D003720:Densitometry; D005069:Evaluation Studies as Topic; D015438:Health Behavior; D006621:Hip Joint / Q000000981:diagnostic imaging; D006622:Hip Prosthesis; D006801:Humans; D011446:Prospective Studies; D011474:Prosthesis Design; D011859:Radiography; D011877:Radionuclide Imaging; D013667:Technetium
chemical_list: D013667:Technetium